Final answer:
To make a safe three-point turn, start by signaling with your left turn signal and checking for oncoming traffic.
Step-by-step explanation:
The first thing to do when you make a three-point turn is signal with your left turn signal, then check carefully for traffic coming toward you. This is a crucial step to ensure the safety of yourself and other road users. Before making this maneuver, it's important to be aware of the surroundings and make sure that it is safe to execute the turn without interfering with oncoming traffic.