Spades Masters is an “easy to understand, hard to master” type of game. So, it is always a good idea to take a step back and go back to the basics, either to freshen up on the rules, or to learn something new.
If you played our tutorial a long time ago, or even if you skipped it entirely, you can always replay it again.
On the main screen of Spades Maser look for the cogwheel on the bottom right corner. Tap it to access the game’s Settings. Scrolling down you will find the option to “Replay The Tutorial”.
Give it a go to see if you might learn something new.