

My main one is to learn shortcuts on your most used programs. Using the mouse for everything is a waste of time, but that has been said multiple times.
My second is to create scripts to do a bunch of repetitive tasks. For example, I have a script I run on my work PC after I log on to the VPN that starts my “always on” programs (like notepad++), unlocks the hosts file, etc. I have some sendto scripts for converting files with pandoc, fetching multiple git repos in one go, etc. It just speeds up things and avoids errors versus me doing them manually.
On Windows I use PowerShell and on Linux I use bash, meaning they work without additional software installed.
That is famously a bad idea.