Git and GitHub

• See https://git-scm.com/downloads for installation choices and other details
• See wikipedia: Version control for more information

Git

• Git In Two Minutes (For A Solo Developer)
• Pro Git book — free to read online
• How Git Works
• theodinproject: introduction to Git — this includes assignments on reading (like the 'Pro Git' book linked above), watching videos, etc
• Version Control (Git) — part of "The Missing Semester of Your CS Education" course by MIT
• Flight rules for Git — what to do when things go wrong
• Boost Your Git DX — best command line Git tools, techniques, tips, tricks, and tactical tidbits

Cheatsheets

• Visual Git Reference for the most common commands
• Git Cheat Sheet (pdf)
• Git Cheat Sheet

Interactive playgrounds

• Git Exercises — learn and practice Git
• Learn Git Branching — git repository visualizer, sandbox, and a series of educational tutorials and challenges
• Visualizing Git Concepts — sandbox playgrounds to help you understand some basic git concepts visually
• GitHub Minesweeper — Learn a professional Git workflow with a bot as your teammate. For free

Difficulties

• Confusing git terminology
• Why Git is hard

GitHub

• GitHub Account Setup and Configuration — a chapter from 'Pro Git' book
• Git and GitHub Handbook
  • GitHub video guides
• Build a Stunning README For Your GitHub Profile
• Getting Started with GitHub Pages
• GitHub Flavored Markdown guide
  • GitHub Flavored Markdown Spec
  • ghostwriter — distraction-free Markdown editor, supports GitHub Flavored Markdown
• GitHub Documentation

Contributing to open source

• How to Contribute to Open Source
• Finding a project to contribute to
• Getting Paid for Open Source Work

Other guides

• /r/learnprogramming/ discussion on Git and GitHub
• Git & GitHub guide by /u/Fateen45