If you are affiliated with Princeton University and are looking for research computing help, you may want to see Research Computing or see the Q-APS Consulting site. A temporary holding place for some Q-APS information is at the Q-APS Wiki.
If you are looking for help with research computing for social sciences at Princeton University, please send an email to firstname.lastname@example.org describing your problem or question.
For specific information on:
using git at Princeton University, see here
using high-performance computing resources at Princeton University, see (somewhat older) documentation here (Q-APS site). a set of setup and example scripts here (github), and the Advanced Statistical Programming Camp materials linked above.
For a broad set of information on different computing topics and languages, see here (Princeton Praxis).
For a coherent guided tour on a specific tool-chain see Software Carpentry and watch for any upcoming bootcamps.
For information on the Princeton Python Users group, see here.