If you need to revert only parts of one or several commits the following workflow can help:

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If you need to revert multiple changes, make a branch and squash it afterwards.

For every commit you need to revert, starting at the most recent, do:

git revert -n [COMMIT] #revert, but don't automatically commit
... #fix any conflicts
git reset #unstage all changes
git add -p #this will ask you for every change, whether you want to go through with the revert (i.e. "y" will revert, "n" will not; "?" for help)
git commit
git reset --hard #throw away all changes you did not want to revert