1. Find an issue that interests you!

Look at some of the open issues and identify one that sparks your interest.

2. Claim that issue!

If you want to work on the issue, leave a comment on it saying that you're working on it.

3. Create a new branch!

Create a new branch by typing git checkout -b issue-x, where x is the number associated with that number. For example, if you decided to work on issue #491, you would type git checkout -b issue-491 and create a branch named issue-491.