First off, you really don't need the terminal if you choose to avoid it. You can get by just fine with a GUI package manager included in the "user-friendly" Linux distros; which is essentially a graphical app store that handles all installs, uninstalls, updates & system updates for you with a point and click.

Second :
Tab key, Auto completion, command cycling, command highlighting, man pages, TLDR pages, and so on.
There's no; absolutely 0, zippo, nada; reason you should, need, or want to remember individual commands or how to use them when the previously mentioned exist.