Yeah no, generally you just copypaste the software website’s instructions. Many programs can be installed through the app store (or equivalent install commands) but a lot of aoftware you just gotta copypaste the code. Many also just provide an inataller.
The meme about linux software being much easier to install is true in some cases, but mostly bullshit. even if its just sudo apt install vlc you generally still want to check the website to make sure its the best way, or you end ip with an out of date version.
Updating software on linux is better pretty much automatic without annoying popups most of the time though.