I have a regular PC with an AMD card in it, what shall i mine or should i buy some coins instead ?
Thank you !

If i was you i would like to mine a new coin.
Do some research about new altcoin that have a good development and potential in the future,
Only that way you can earn profit,if you want to mine something like ETH or XMR you will only gain a loss.
Because the difficulty is too high and you electricity fee.
But if you want,you can try your luck mining in nicehash like other people did.
Just beware,do not push your pc to the corner because it will only bring a harm to your pc