I do. But, I have been sea swimming since childhood. I am a strong swimmer and former lifeguard. I usually swim at beaches I know (mostly Bournemouth/Boscombe, Southsea/Eastney, sometimes Weymouth.) I don't often go deeper than waist/chest level (especially now the rafts have gone from Greenhill. 😞)
Swim parallel to the shore. Learn how to read the waves, recognise rips etc. If the waves are too strong or the current too fierce, don't risk it, and get out.
Find out the tide times - it changes the nature of the water. High water and low water swims can feel very different in some places.
I look to see if there are others about - if no one else is in the water, I probably wouldn't, as I'd assume there's a reason for it.
If you're hoping to go regularly, get to know the beach - is it sand or pebble underfoot? Is it the same under the water? Quite a few south coast beaches are pebbly, but once you're out in the water, it's more sandy underfoot - but there could also be rocks etc. Does it shelf suddenly or is it a gentle gradient? Also, there are weever fish about currently- wear swimming shoes.
You can check water quality, water temperature, tides, weather forecast all online.
If there are lifeguards, swim there.
Find out if there's a swimming group, join in.