What's the recommended procedure when you need to stop using the SD Card?
If you didn't used your card as internal storage using adoptable storage feature or apps like link2sd than you shouldn't worry about anything, you just pull out card. But if your photos, and some other files are on sd card and you need it on phone than you should transfer it to internal storage via some file manager. Only trouble you can get is that some apps requires sd card and they won't work I think that world of tanks is one of them..