I know there are Login Items under Users & Groups and
Users/FooUser/Library. And then there's right click on Dock icon -> Options -> Open at Login.
What other methods are there for apps to auto-start? The reason why I'm asking is because the Spotify App (downloaded from http://www.spotify.com) keeps starting up whenever I restart my Mac, even though I made sure there is no corresponding entry in any of the above mentioned places.