Not everyone is familiar with all the things that can be done on Linux. However, I'm going to try to collect useful tips and tricks.
The bash shell has a lot of ways for you to quickly work on the commandline. One of the big things is that there's bash autocompletion which allows you to quickly navigate and complete your entries.
Git for System Administrator (LinkedInLearning.com)
More in depth information can be found in multiple places. For example this here
Filesystem utilities and checks
NEW! Filesystem resizing