1.
Introduction
2.
Math
2.1.
Tex
3.
Computers
3.1.
Applications
3.1.1.
Web browsers
3.1.2.
Terminal emulators
3.2.
Hardware
3.2.1.
Disk management
3.2.2.
Display
3.3.
Operating Systems
3.3.1.
UNIX
3.3.2.
Linux
3.3.2.1.
openSUSE
3.3.3.
MacOS
3.3.3.1.
"Exotic" shells on MacOS
3.3.4.
Windows
3.4.
Games
3.5.
Internet
3.5.1.
Wikipedia
3.5.2.
Twitter
3.6.
Programming languages
4.
Music
Light
Rust
Coal
Navy
Ayu
आवीनधॄ विद्या
Internet
/r/askreddit: What's a free resource available to everyone that most people don't know about or take advantage of?