+1 @lordmelton
Most streamers have their own app, or they may direct to you to a third party app, such as m connect. The app will then help you play your sources. For example, with mConnect there is a place to enter your Tidal account information. Then everything shows up there, such as your playlists, favorites, etc.
If you have files stored on the computer that you want to play, the app will attempt to recognize the computer as a source and will organize your files so that you can play them from the app.
Roon is a major step up the latter in complexity. I recommend getting the basic feel of using the streamer down first, then do a Roon trial when you are comfortable.