Welcome newbie open source contributors!

This is a list of resources for people who are new to contributing to open source.

If you find additional resources, please contribute a pull request.

If you have questions or comments, please create an issue.

Contributing to open source in general

Up For Grabs - a list of projects with beginner-friendly issues.
Issuehub.io - a tool for searching GitHub issues by label and language.
Code Triage - another, really nice, tool for finding popular repositories and issues filtered by language.
First Timers Only - a list of bugs that are labelled "first-timers-only".
YourFirstPR - starter issues on GitHub that can be easily tackled by new contributors.
Awesome-for-beginners - a GitHub repo that amasses projects with good bugs for new contributors, and applies labels to describe them.
Openhatch - a non-profit organization that helps lower barriers of entry into open source. You can find bugs and projects here, as well.
Open Source Guides - Collection of resources for individuals, communities, and companies who want to learn how to run and contribute to an open source project.
45 Github Issues Dos and Don’ts- Do's and Don'ts on GitHub.
GitHub Guides - basic guides on how to use GitHub effectively.
First Contributions - Make your first open source contribution in 5 minutes. A tool and tutorial to help beginners get started with contributions.

Search links that point directly to suitable issues to contribute to on GitHub.

Good First Bugs - bugs that developers have identified as a good introduction to the project.
Mentored Bugs - bugs that have a mentor assigned who will be there on IRC to help you when you get stuck while working on fix.
Bugs Ahoy - a site dedicated to finding bugs on Bugzilla.
Firefox DevTools - a site dedicated to bugs filed for the developer tools in the Firefox browser.
What Can I Do For Mozilla - figure out what you can work on by answering a bunch of questions about your skill set and interests.
Start Mozilla - a Twitter account that tweets about issues fit for contributors new to the Mozilla ecosystem.

Oh shit, git! - how to get out of common git mistakes described in plain English.
Atlassian Git Tutorials - various tutorials on using git
GitHub Git Cheat Sheet (PDF)
freeCodeCamp's Wiki on Git Resources
GitHub Flow - GitHub talk on how to make a pull request.
GitHub Learning Resources - Git and GitHub learning resources.
Pro Git - The entire Pro Git book, written by Scott Chacon and Ben Straub and published by Apress.
Try Git - Learn Git in your browser for free.
Git-it - Step by step Git tutorial desktop app.

Producing Open Source Software - Producing Open Source Software is a book about the human side of open source development. It describes how successful projects operate, the expectations of users and developers, and the culture of free software.
Open Source Book Series - Learn more about open source and the growing open source movement with a comprehensive list of free ebooks from https://opensource.com.