Hello, I have 0,5BTC and I want to sell this, but I don't known where I can sell.. anyone can help me?
No one can help you unless we know your country or at least the payment method acceptable to you?
there are plenty of direct and indirect methods. they depend on your state, payment method, and documents that you are ready to submit.
try to use ---->
https://www.buybitcoinworldwide.com/ or google "Sell Bitcoin <your country>"
I feel weird, people who have 0.5 bitcoin but don't know how to sell it
He may have bought these coins in the past, they had no value in the past.