Which difftool do you use and why? I develop on Windows and I use KDiff3. It has worked flawlessly all these years. And just because of that I haven't really followed what else is out there. I suspect I'm in the minority?

My favorite is git h, which produces a nicely summarized log of commits on the current branch, with some highlighting and relative dates:

[alias]
    h = log --graph  --abbrev-commit --date=relative --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset'

What's your favorite Git alias?

Tools are critical for all professions. In programming, Git is central. Almost everything we do touches Git. We all need to master it at least to a level that it doesn't get in our way. But when you start getting hold of the basic concepts, it's also a powerful tool that is fun to work with. Hopefully this community will be a place to share our knowledge and help each other.