I agree completely. On that note, I also consider `git add -A` to be horrible practice. Adding files manually makes you tons more aware of what changes you actually made, and also prevents you from accidentally adding extra files you don't want.
I also recommend people to look at the Linux kernel git history for good examples of how to use git well. Even if you have no knowledge of kernel code (and most people don't) it's still extremely clear how each commit makes a single change and is fairly easy to review. Now, the Linux kernel has the luxury of being able to demand people fix their commits, but that's not to say you shouldn't strive to reach similar states in your commits.
I also recommend people to look at the Linux kernel git history for good examples of how to use git well. Even if you have no knowledge of kernel code (and most people don't) it's still extremely clear how each commit makes a single change and is fairly easy to review. Now, the Linux kernel has the luxury of being able to demand people fix their commits, but that's not to say you shouldn't strive to reach similar states in your commits.