Learn Github, Neo4j and Ngrx-store

SSH provides a secure way for your to [connect to and authenticate with GitHub's servers](https://help.github.com/en/github/authenticating-to-github/about-ssh). While HTTPS connections use usernames and passwords as credentials, SSH instead uses public and private key pairs. These can be generated on your system using a CLI like [`ssh-keygen`](https://help.github.com/en/github/authenticating-to-github/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent) and then associated with your GitHub account using the public key.

In some cases, you may need to connect to more than one GitHub account from the same system. For example, you may have [separate accounts for personal and professional projects](https://ryanharris.dev/managing-ssh-keys-for-github/), which can be difficult to manage manually. Using `ssh-agent` and a SSH configuration file, you can alleviate this pain point by automatically determining which key to use based on your GitHub repository's `git` URL.

Bash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell. Bash is a command processor that typically runs in a text window, where the user types commands that cause actions. Bash can also read and execute commands from a file, called a shell script.

bash

Secure GitHub connections with SSH

Github Actions are an awesome tool from Github that allows us to automate tasks using code-based workflow configuration files. There's also a large marketplace that comes stocked with many useful tools that are ready out of the box.

But sometimes the options available don't completely solve our needs or maybe we're working with a new technology that's simply not available as an Action yet. Luckily, Github allows anyone to create their own Actions using common technologies like Javascript via Node.

We'll learn how to create a new Javascript-based Github Action running on Node. We'll first walk through a simple Hello World example, learn how to test it locally, version control it, use it in the wild, and move on to more advanced solutions that include using packages from npm!

GitHub fosters a fast, flexible, and collaborative development process that lets you work on your own or with others.

github

Create a New Github Action to Automate Code Tasks with Javascript

As your Angular application grows, it becomes more difficult to manage application state.

NgRx can help with that!

In this course, we will learn how to convert an Angular application from using stateful services into using NgRx.

We will accomplish this by adding a new feature, including building a reducer and actions. We'll also touch on using selectors to query our state, managing collections with NgRx entity, async operations, and hiding implementation details with the facade pattern.

Angular is a development platform for creating applications using modern web standards. Angular includes a wealth of essential features such as mobile gestures, animations, filtering, routing, data binding, security, internationalization, and beautiful UI components. It's extremely modular, lightweight, and easy to learn.

angular

Reactive State Management in Angular with ngrx

Handy tips for boosting your productivity in GitHub. These are bite-sized things you can take advantage of today to boost your efficiency by 1% or more. What are you waiting for? Check 'em out! 

GitHub Tips & Tricks

GitHub Actions are a powerful workflow tool that allows you to write and use custom code to execute workflows. It's like a serverless CI/CD platform built directly into GitHub. We have access to GitHub's registries, our own repos, multiple platforms (Mac, Windows, Linux), runtimes (VMs and Containers), and languages (JS, Rust, Go, etc) to perform any action we want. We can trigger workflows using GitHub's own events, our custom events, or even scheduled events like a cronjob.

GitHub Actions at Work

In this course we will learn some of the basics of getting data into and out of Neo4J, as well as touch on some of the libraries and tooling available in the Neo4J community ecosystem, which we will leverage to quickly create and use a full-featured GraphQL API.

We will start by learning how to run and interact with Neo4J locally. Then we will develop a graph model in which to store the data that we pull from SWAPI via REST. We will then create an Apollo GraphQL API driven by a few simple schemas which fit into this model. We will then write some simple code to crawl SWAPI and insert the data into Neo4J through our GraphQL API. Once there is data in the store, we will learn about some of the features in `neo4j-graphql-js` that make connecting and accessing our graph Nodes easier.

Neo4j delivers the lightning-fast read and write performance you need. Neo4j combines native graph storage, scalable architecture optimized for speed, and ACID compliance to ensure predictability of relationship-based queries.

neo4j

Build a Neo4J & GraphQL API

Publishing a JavaScript library for public use requires some extra steps. You need to think about how people will use the library. From end users, to contributors your library now has a variety of people outside of yourself potentially making use of the code that you've released into the wild.

From Github and npm, to releasing beta versions, semantic versioning, code coverage, continuous integration, and providing your library with a solid set of unit tests, there are a ton of things to learn.

This series will guide you through a set of steps to publish a JavaScript open source library.

You might also enjoy [this article about contributing to open source](https://egghead.io/articles/get-started-contributing-to-javascript-open-source).

How to Write an Open Source JavaScript Library

“Feel free to submit a PR!” - words often found in GitHub issues, but met with confusion and fear by many. Getting started with contributing open source is not always straightforward and can be tricky. With this series, you’ll be equipped with the the tools, knowledge, and understanding you need to be productive and contribute to the wonderful world of open source projects. Much of this series speaks about GitHub, but most of the concepts are generally applicable to contributing to any open source project, regardless of where it’s hosted.

So enjoy the course and start contributing to the projects you use and love today!

Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.

How to Contribute to an Open Source Project on GitHub

***Note: RxJS imports have changed since the publication of this course. The concepts being taught on RxJS are still applicable.**

Angular has many built-in features for working closely with RxJS to help you build entirely reactive applications. This course will teach you how to use Angular with RxJS. We will learn how to use the ngrx/store library to manage state in a clean, reactive "Redux style."

This course assumes you've got a working knowledge of Angular and reactive programming with RxJS. If you don't, you might want to watch the following courses to get you up to speed! 
- [Get Started with Angular](https://egghead.io/courses/get-started-with-angular) 
- [Introduction to Reactive Programming with RxJS](
https://egghead.io/series/introduction-to-reactive-programming). 
- [Step by Step Async Programming with RxJS](https://egghead.io/series/step-by-step-async-javascript-with-rxjs) 
- [Getting Started With Redux](https://egghead.io/series/getting-started-with-redux), a course by Redux's, Dan Abramov.

We also have Intermediary Angular courses if you'd like to acquire more in-depth knowledge. 
- [Dependency Injection](https://egghead.io/courses/angular-2-dependency-injection-di-explained
- [Components, Directives](https://egghead.io/courses/building-angular-components)
- [Forms](https://egghead.io/courses/intro-to-angular-forms)
- [Router](https://egghead.io/courses/intro-to-angular-router)
- [Animating Web Apps](https://egghead.io/courses/animate-angular-web-applications)



Build Redux Style Applications with Angular, RxJS, and ngrx/store

In this lesson, we’ll apply our knowledge of `getopts` and create a script that opens a PR on Github, all without leaving your terminal. We’ll use `getopts` to take 3 options: username, password or token, and PR title. We’ll use any input after that as the body of the PR. We’ll validate the input and then use `curl` to POST it to Github. 

Create a Bash Script to Open a Pull Request on Github using getopts

In this video you'll learn Git-based deployment for web applications for both front-end and back-end resources using AWS Amplify and the Amplify Console.

Hosting & Continuous Deployment for Front End and Serverless Back Ends using AWS Amplify

GitHub Actions can be triggered to run on a schedule using cron syntax. In this video we go over what that means and how to write cron syntax. We also show a tool and a series of examples to aid in writing and debugging cron.

* https://crontab.guru/

Scheduling GitHub Actions with cron

GitHub Actions can feel daunting. Here's a walkthrough setting up your first action that runs some command line scripts on every push to master.

Using your first GitHub Action

GitHub Actions are a powerfully flexible workflow automation tool that lets you respond to GitHub events, your own arbitrary events (like webhooks), or scheduled events with workflows that run on Windows, Mac, or Linux in VMs and Containers. It's like a serverless CI/CD platform built into GitHub.

Introduction to GitHub Actions

If you contribute to open-source software with four valid pull requests on GitHub — the good folks at DigitalOcean send you a free limited edition T-Shirt and a couple of cool developer stickers for your laptop. This is a fun reminder for everyone that FOSS (Free & Open Source Software) is important. 

In this video, I am going to teach you:

1. How to register for Hacktoberfest!
2. How to contribute to open-source software!
3. How to create a GitHub pull request the right way!

Peace! ✌️

How to Start Contributing to Open Source for Hacktoberfest With a Github Pull Request

If you make a mistake in a commit message but HAVEN'T pushed it yet, you can change that commit message with --amend:

`git commit --amend -m "New message"`

This won't change any of the files in your commit - but will rewrite the commit with the new message.

Change a Commit Message that Hasn't Been Pushed Yet

If we make a change to the same function both locally and remotely, then when we try to pull down the remote changes, we'll run into a conflict - and git won't pull the remote changes down.

So first, we'll use `git stash` to stash the local changes, and then `git pull` to get the remote changes.  To apply the stashed changed, we'll then use `git stash pop`

Since we changed the same function however, we'll get a merge conflict!  So we'll fix the merge conflict, and then add and commit that change.

Finally, we'll drop the change from the stash with: `git stash drop stash@{0}`

Use `git stash` to Save Local Changes While Pulling

If we try to make a pull request on github that has a conflict, there are a few ways to fix it.

We're going to first back out of the pull request, and then merge `master` into our feature branch.

We'll manage the merge conflict locally, and then do a new pull request (which will not have the conflict)

Fix a Pull Request that has a Merge Conflict

We've made a pull request and now we can clean up the branches by deleting the feature branch.

Branches are just pointers to commits - so we can safely delete branches without losing the underlying commits (once the commits are merged back into master).

So we'll use the github interface to delete the branch remotely, and to delete it locally we'll use `git remote prune origin --dry-run` and then `git remote prune origin`

That will tell us that the remote is gone, and we can finally clean up the feature branch with: `git branch -d feature-branch`

Cleanup and Delete Branches After a Pull Request

We make a .env file and accidentally push it to github.  

In order to remove the .env file, we first have to add it to our .gitignore file - but that's not enough, because the .env file will still be on the branch on github.

So we can remove all of our files from our git cache with:

`git rm -r --cached .`

and then add back all the files we want with:

`git add -A`

(that will exclude the .env file this time - because of the .gitignore file).

Then we can commit that change (which is effectively the same as removing the .env file), and push it, which will remove the .env file from the mater branch.

IMPORTANT! If you have secrets in a file that you remove in this way, you should still consider those secrets compromised, because anyone could have pulled them already - and they are also still in the git history.

git Ignore a File that has Already been Committed and Pushed

If we want to completely remove a file from github - including all history - there is a tool that we can use called the BFG.

The github help article is here:

https://help.github.com/en/github/authenticating-to-github/removing-sensitive-data-from-a-repository

And the BGF itself is available here:

https://rtyley.github.io/bfg-repo-cleaner/

We'll start by downloading the BFG jar file, and then cloning a mirror of our repo with:

`git clone --mirror [repo-url]`

Then we can delete our .env file with:

`java -jar ~/Downloads/bfg-1.13.0.jar --delete-files .env my-repo.git`

which will delete the .env file. Then we can use the following command to prune the entire history and garbage collect the remains:

`git reflog expire --expire=now --all && git gc --prune=now --aggressive`

And finally, use `git push` to push that change to github, and remove the .env file from all of the history on github as well.

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