Interact with smart contracts

[PercT4b]

Hi there, my knowledge about cryptos is not so on point, but I was trying to learn how to interact with smart contracts.


I'm realizing that asking for every existing function is just useless, so, does anybody know a website/youtube channel/any other guide that could teach me how to use a smart contract (I think it mostly depends on the programming language).


Just to make a practical example, the contracts we see on Bscscan (or Etherscan), which language they use and where could I learn to use the functions that are shown?