NVidia Driver and CUDA on Debian
To install NVidia proprietary driver on Debian, it's often just 'sudo apt-get install nvidia-driver'.
If you need a newer driver directly from NVidia, these short notes show you how.
GPU
Cracking Passwords with Hashcat
Systems don't store original passwords, they store hashes. They look like this "f2477a144dff4f216ab81f2ac3e3207d". Hashing is a one way function, so you can't turn it back to password.
But you can make computer try every word in the dictionary, and tell if one matches. This article shows you how to do this with hashcat.