hi does anyone know if its possible to add to an nfts metadata post mint ?

example i made a pokemon nft I want to give it a function where I spend x amount of a token and level it up and the nft image changes is this possible ?

the contract code has to support this kind of stuff. So if you add that there, then yes

what if the nfts were already minted could I update or migrate the code - I'm a noob ?

most likely not. The contract would need to have some sort of upgradeability mechanism, and NFTs don't usually have that

so Id have to create a new series with that feature then ?

yes

thanks , also is it hard to fork tomb seperate topic ive been doing basic solidity for a few weeks want to try something more tangible

I'm not sure what you mean with that, but if you mean forking some existing source code, then that's not too difficult. understanding it and making changes is the hard part

got it thanks , im getting more used to using git and forking source code