playing bridge in a suit contract
Unlike playing in no trumps where you start off by counting your winners, in a suit contract you start off, after the opening lead, by counting your losers.
The contract shown on the right is four spades or ten tricks. Regardless of the opening lead when you look at dummy you can see you have one looser in diamonds and one in clubs where, in both cases, the ace of the suit is missing.
Let's assume that the ace of clubs is led by the opponents followed by the four of clubs round to your king which takes the trick. What next?
The accepted wisdom is to play your high trumps to make sure the opponents have none left although that's not always the best way to play. Once you have done that you will still have a trump left and you can now establish your second suit which is clubs in this case. With the ace and king gone you can make all the remaining club tricks followed by the ace and king of hearts and you still hold the last trump which gives you the ten tricks you require.
This, of course, is an easy contract to make and you could almost play it with the declarer's hand face up! Other suit contracts are much more difficult to play and require lots of careful planning to succeed. Finesses have already been discussed and you may need to finesse to make the contract. You can also make the contract by cross trumping and squeezing the opponents until they throw the wrong card away enabling you to make tricks from a long suit.
As can be seen, there are lots of options and I have only scratched the surface of the play here. The only way to learn bridge is to play it although I hope you have gained some insight on this website.