I start with everytime you hit save. Can you describe your change in one sentence? Commit it. Then after you get into the rigor of committing that frequently, then you can begin to scale back. It's more art than science.
Every time I save? Good lord! I save at least once every 2 minutes.
Lol, but you get my point. It's extreme, but you have to think about the changes you made. Adding classes and methods can constitute a commit.
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