Hello new Linux user! So yes, your correct when installing apps on Linux sometimes you might need to do it via command line other times you'll get a nice install file you can double click. It's really down too the software manufacturers on how they choose to package it.
In general with Linux you'll find there's still a lot of command line usage compared to Windows or osx. On those platforms for most users they would barely touch a terminal except in some kind of bug fixing emergency.
Some distros come with their own app store built in (like the windows or osx app store) and allow you to install a bunch of apps via the gui.
What version of Linux did you go for out of interest? Some are much more beginner and use friendly than others.