When you sit down to do something, how many of these projects do you touch? If the answer is "one", then do a git repo for one. The answer you should ask yours

When you sit down to do something, how many of these projects do you touch? If the answer is "one", then do a git repo for one. The answer you should ask yourself is "when I look at the git log, which history(ies) would it make sense to see together".