Linux cheat sheets
An alternative to the man pages that display quick command line examples:curl cheat.sh/ls (replace ls with command) Github page
sudo snap install cheat
tldr
pip install eg Github page
There are some cheat sheets on Github including
awesome-cheatsheets
As well as outside of Github, such as Cheatography and quickref.me
Man pages can also be found online such as man7
Archive of man pages on manned.org
You can also use the --help or -h argument on a command. Example gzip --help
Another alternative to the man pages is info and pinfo
Example: pinfo tar
Keyboard commands for info and pinfo are Enter to follow the link under the cursor and u to go back to parent node. More shortcuts here
To search for a command you can use the apropos command
Explain Shell script that uses mankier.com
If you want to learn how to use Linux, try my resource of tutorials.