Many players take and spend a lot of money on tennis lessons. However, there comes a time when you want to become more competitive. If you go on the court and you are still thinking about your grips, your form, etc., you might be missing the boat. Just trust your basics and that they will work well under pressure.
 
So now, "start noticing" what your opponents are doing. Start noticing how they prepare their racket before they hit the ball. For example, when your opponent is on the baseline, when they draw their racket way back, look for a drive, when they drop their racket head down, look for a lob, and when their racket head starts from high to low, look for a short ball or a drop shot.
 
When our opponents are at the net take notice of the height of their racket. If the racket goes down below their waist, look for a weak ball that pops up and move in to attack it. If their racket sets up near or a little above the shoulder height, stop and defend. Don't move in, they are on the offense. If you see their racket drop their back and they turn sideways, quickly move back and just defend. They are completely offensive and you are completely defensive.
 
Many times, noticing what your opponent is about to do is better for you than worrying about yourself. Let's start noticing!
 
Good luck on the courts!