Spotify is a most popular streaming music online, however, you can't play Spotify songs offline without internet connection. But don't worry, in this case, you can also follow this tips to download spotify as aac or other formats of files to play offline. https://www.drmare.com/spotify-music/convert-spotify-to-aac.html

Spotify Premium costs $9.99 , but to save your money, you can follow this tips to get spotify premium free. Hope this tips help you well.
https://www.drmare.com/spotify-music/get-spotify-premium-free.html