If the man pages and the output of --help is too much reading for you, I can recommend tldr pages. It’s a community composed “alternative” to the man pages containing nothing but brief examples of the most common uses for most terminal commands and programs. Like the man pages, you can use tldr pages either from a browser, or from the termial.
To install tldr pages run
sudo pacman -S tldr
and then just run, for example,
tldr firefox
The biggest pro of tldr over man is its brevity, usually the entries are short enough even for people with the shortest attention span. The biggest con of tldr compared to man is its brevity, it is quite rare that I find there somehing I did not already know. It is certainly not a replacement for man, and it doesn’t attempt to be that. But I do occasionally find it useful when I forget the order of options or syntax of some command…