For those who are learning to swim for the first time, they should first understand the harm of improper water and water treatment to swimmers. Then consider how to learn the actions you want to learn.
Detailed steps before entering the water correctly: first, pour the water on the chest hall at least three times by hand to quickly adapt to the water temperature. Avoid cramps, panic, drowning and other accidents caused by too large temperature difference. Second, look for shallow water (at least not higher than your chest). Don't rush into deep water at this time. You should study in shallow water for at least a week to adapt to the floating effect and shallow diving (try to immerse your head in the water and master the time limit for diving in one breath). The average person's diving time should be 45 seconds, which means that the average person's diving time and depth will start from this time. Otherwise there is a danger of drowning. Thirdly, when you have this diving experience, go into the waters at the same height as people and learn to tread water, breaststroke, backstroke and dive.