Hello all pro swimmers here. I couldn't seem to find any thread related to swimming other than this. I'm a total beginner in swimming and I really want to be a better swimmer (also to have better stamina) for my health after MCO ends.

Not sure if this is the correct place to ask but I want to learn how to tread water by myself and swim a longer distance. As most of you are experienced swimmers, do you think it's possible for me to do it without an instructor?

yup.

and it might not be easy to switch to proper stroke once you are used to your own strokes.

I saw one guy swim butterfly really like so wrong... I think he learned himself one.