It is a waste of time to practice swimming when you are nervous in the water.
After fully relaxing in the water, finding someone to guide swimming will get twice the result with half the effort. It is best to prepare the following things:
Watch the floating swimming video online.
After wearing the school bathing suit, dive in the deep water area for more than 10 times, fully relax, and you will be OK if you are not afraid of water.
Feel the buoyancy in the water and keep the balance in the water.
Inhale with your head up, exhale slowly underwater, and don't inhale through your nose.
After the above preparations, then ask the coach to guide the movements, learn the movements of the feet first, and learn the movements of the hands 2-3 times before learning to swim.