If you're trying to turn on your pool lights and all the lights are unresponsive and not turning on you likely have a tripped GFCI Circuit Breaker. Luckily in most cases, this is a very simple fix.
The first step is to head over to your pool equipment area and locate any electrical receptacles/outlets that were installed as part of your pool installation. You're looking for a receptacle that has two tiny buttons between the two outlets like the one shown in the picture below.
You can think of a GFCI as a circuit breaker that is much more sensitive than the standard breakers in your home's electrical panel. GFCIs are designed to trip if they detect a very small amount of current going to ground. If this doesn't make sense to you, just know that they are designed to prevent electric shock to swimmers caused by your pool lights.
Pool lights are wired through one of these GFCI receptacles by the pool's electrician as a safety precaution but due to their incredible sensitivity, they can from time to time trip accidentally. (better to be safe than sorry).
All you need to do to reset the GFCI breaker is press the tiny reset button between the two outlets as shown below.
When pressing the reset button you should feel it click into place. After you push the reset button a tiny green light will illuminate on the receptacle indicating that the outlet is live. You may have multiple GFCI Receptacles near your pool equipment area. Make sure you have reset every outlet as the pool lights could be wired into one or multiple GFCIs depending on your pool setup.
Now that you have reset the GFCI you can attempt to turn on your pool lights as you normally would. Hopefully, this has solved the issue with your pool lights.
If after a few attempts, you notice that the GFCI continues to trip or the lights still don't work it's possible you have a faulty pool light which could require replacing. Submit a service ticket for more assistance.