What are git worktrees, and why should I use them?
Git worktrees have been around since 2015, but it wasn’t until recently they became popular. Learn what they are, how to use them, and why you might.
Cassidy Williams
Sr. Director, Developer Advocacy, GitHub
Cassidy is senior director for developer advocacy here at GitHub. She enjoys building software, advising startups, and teaching developers how to build better. She has a weekly newsletter at cassidoo.co/newsletter where you can get her updates, practice coding problems, and a joke in your inbox!
Posts by this author
Building an emoji list generator with the GitHub Copilot CLI
See how we created an emoji list generator during the Rubber Duck Thursday stream.
Build a personal organization command center with GitHub Copilot CLI
Learn about the productivity tool one GitHub engineer built, and how AI supported the development process.
What AI is actually good for, according to developers
AI is designed to help you do what you love most, not replace your expertise. Discover how developer feedback and real-world experience are shaping AI coding tools that keep you in control.
Why AI is pushing developers toward typed languages
AI is settling the “typed vs. untyped” debate by turning type systems into the safety net for code you didn’t write yourself.
5 podcast episodes to help you build with confidence in 2026
Looking ahead to the New Year? These GitHub Podcast episodes help you cut through the noise and build with more confidence across AI, open source, and developer tools.
What 986 million code pushes say about the developer workflow in 2025
Nearly a billion commits later, the way we ship code has changed for good. Here’s what the 2025 Octoverse data says about how devs really work now.
How to make your images in Markdown on GitHub adjust for dark mode and light mode
When you want your images to look good in Markdown on GitHub, you might have to adjust for the UI around them.
Which AI model should I use with GitHub Copilot?
Ever wondered which AI model is the best fit for your GitHub Copilot project? Here are some things to consider.
What the heck is MCP and why is everyone talking about it?
Everyone’s talking about MCP these days when it comes to large language models (LLMs)—here’s what you need to know.
Video: How to create checklists in Markdown for easier task tracking
Ever wondered how to create checklists in your GitHub repositories, Issues, and PRs? Make task lists more manageable in your GitHub repositories, issues, and pull requests.
OpenAI’s latest o1 model now available in GitHub Copilot and GitHub Models
The December 17 release of OpenAI’s o1 model is now available in GitHub Copilot and GitHub Models, bringing advanced coding capabilities to your workflows.