If you want to tan on the beach, apply spf4-15 sunscreen according to your skin color and expose yourself to the sun for an hour.
If you don't use sunscreen when tanning, UVA and UVB will hurt your skin even if you haven't been sunburned.
When protecting your skin, you should also pay attention to protecting your lips from sunburn. Apply sunscreen 30 minutes before going out, so that the skin can fully absorb the sunscreen.
If you find your skin red, you've already sunburned. Continued exposure to the sun will only hurt your skin.
Place beach chairs and towels in direct sunlight.