On your phone, do you search the software you want to install through your browser?
Yes. Not everything I have is installed through the Google store. I grew up in an era before walled-gardens.
Similarly, on Linux, your chosen distro comes with a (or perhaps multiple) package manager(s) and a software center. Those should first and foremost be consulted. And for 99% of the cases; this is the intended, supposed and supported way of installing said software.
I should clarify - I know what a package manager is. But you’re acting like one needs to have some expert skills to install things outside of the package manager. It’s generally preferred for a number of reasons but it’s not bad “per se” to install something outside of it.
Used to be a time where the install instructions were ./configure && make && make install…