Point taken.

Maybe this will help: https://f-droid.org/packages/com.inspiredandroid.linuxcommandbibliotheca

For other OSs, the github has download buttons on screen. https://github.com/SimonSchubert/LinuxCommandLibrary

It's a tool and has a tldr section in case you don't want to read everything about a command. Sometimes I get bored and read through it just to brush up.

Send an IM if you need anything specific.