If you look at the introduction to Raspberry Pi OS they show how to use the GUI software installer, as well as the command line. None of this is secret and Linux (and other OS) had package management a very long time before Apple or Windows products. I feel that people are just more familiar with Windows having spent so long using it. The raspberry Pi people are pretty clear in their documentation, since it's primarily aimed at children and those teaching them. Observationally I rarely see anyone look in the Windows documentation, mostly they just do a web search if they want to find out how to do something. The people who look up the Microsoft docs are the same as those who'd look up the Solaris/Linux/GCC, whatever docs. Just using Linux as an OS is perhaps the sanest way to get to grips with it.