In general, I try to limit the amount of time I spend messing around with bash and Vim settings. Time spent on configuration is, um, time not spent on producing.
However, there are a few git configurations that are essential for developers:
1. Displaying the branch you are on from the command line prompt: https://gist.github.com/henrik/31631
2. A pretty git log: https://coderwall.com/p/euwpig?i=3&p=1&t=git
3. Shortcut to autocomplete git branch names: http://code-worrier.com/blog/autocomplete-git/
Get these set up as soon as possible, so you can get back to doing real work!