pro-beginner tips:

• man program | less -p "specific function inside the program". scroll with "n" to the different occurences where the searched expression has been found (and shift+n to go back one search term)
• example: man less | less -p "-p" searches in the manual of the programm less for the search-pattern "-p". this works with the help flag as well. egs. less --help | less -p "-p". mostly --help or -h provides only a rougher help than the man(ual) but sometimes there is no manual.
• | pipes the outpout of the first command to te second command. so less searches via -p the whole man page and starts its output at the first occurance of the searche pattern.

• man -K "Search-Pattern" searches every man page for a certin pattern (slow!)
• apropos "search-pattern" searches in programm description for a pattern and results in a list with programm names.

• install tldr (too long didnt read) tldr programm gives you the most used use-cases of a programm and often some inspiration.

• !! repeats the last command. so with sudo !! you can repeat a command where you forgot to put sudo ;)

• Learning shell-scripting and python.
• Always happy for tips and tweaks on Linux.
• Running a debian derivat.