Chess is 99% tactics. If this celebrated observation is true for the master, how much more so for beginners and casual players! If you want to win more games, nothing works better than training combinations.
There are two types of books on tactics, those that introduce the concepts followed by some examples, and workbooks that contain numerous exercises. Chess masters and trainers Franco Masetti and Roberto Messa have done both: they explain the basic tactical ideas AND provide an enormous amount of exercises for each different theme.