can I take a shower wearing my apple Watch SE 2nd generation?
It doesn't mention it anywhere in the user information
Apple Watch SE, watchOS 11
Yes. Just make sure you rinse it thoroughly so no soap is left on it.
click here ➡️ About Apple Watch water resistance - Apple Support
Also, make sure the band you gave on it is one of one’s meant for water activities and not the leather or knitted ones.