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1. Master is Sacred. The master branch is like subversion's trunk. Successful projects tend to keep these in a state where releases can be made with minimal effort. Therefore, only code that has been fully tested is allowed in.
2. Code in Branches. See #1. Branches are extremely easy to create in git, and they don't go to the origin repository unless you explicitly push them. Use a relevant issue id as the branch name whenever possible. Also, convention in git-land seems to be that tags and branches are named all-lowercase, so if I have an issue named MYPROJ-42, name the branch myproj-42.
3. No Merge Commits. A merge commit is technically a commit with two "parent" commits in git. The problem is, if you're not careful, you'll create a lot of these unintentionally just because of the nature of distributed version control. Merge commits may reflect "the truth" about what happened in the repository, but they can be extremely difficult for people to understand. Linear commit histories are much less likely to make your fellow committers grumble when trying to understand review your changes. See How to Avoid Merge Commits below.
4. Squash Commits and Use Good Commit Messages in Master Commit as many times and with whatever level of log message detail you want while your branch is in development. But when merging it to master, keep in mind that the granularity of the commits and the content of the messages need to be useful to people besides you. See How to Squash and Re-word Commits and How to Write a Good Commit Message below.
5. No Old Branches. When you're done with a branch, whether it's been merged to master or not, delete it. It's just clutter. The history of the master branch is what matters. To remove a local branch, git branch -d branchname. To remove a remote branch, git push origin :branchname.
6. Consistent Release Tags. In the git world, people tend to name release tags like "v1.0.0". I like this convention (including the trailing zero) because the Major.Feature.Bugfix convention is compatible with semantic versioning and is commonly seen with Maven artifacts.
7. Never Rebase Public Commits or Force a Push. Rebase (described in the sections below) is a useful tool for doing surgery on private branches, but it has potential to cause serious problems if you use it with commits that have made it outside your local repository. Therefore:
   • If people pull a branch from you regularly, you should consider all commits on that branch to be immediately public and never rebase on it at all.
   • If you attempt to push history-modifying changes to a remote branch, git will notify you of the conflict and tell you how to force it. Don't force it.

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