I tend to do different things based on how I feel that specific day:
Play Minecraft (CL's DW20 server).
Attempt to fix computers I have.
Build electronic circuits.
Mess with the secondary computers I have, testing different OSes, enabling keyboard and mouse sharing...
Write code for a Minecraft test mod. I will then use it as a template.
Go to my high school and fix the broken computers that are there.
Read and/or watch random stuff.
Chat with people on Discord. (I am in 14 servers...)
Or simply stare at my computer screen doing nothing