Forex Taxation help

Hello everyone,

I would like to ask a question about taxation.
I have done my research and I have seen many different answers about forex taxation.
Some of them say that forex isn’t taxable some say 15% some 40% etc…
I am so confused and i dont know what is legit or not.
I live in Greece, Europe.
Does anyone know and can help me?

Thank you for your time!