To be more descriptive: There are a lot of concepts and they seem complicated to me. I am asking for your help in this regard. Today I contacted a user in a server. And he told me about the packages, which started with the letter C, and I remember it as C0. There was a letter or a number or whatever. But I didn't understand anything the user was talking about. He sent me 20 packets with 1 hit, telling me about creating a class to do extreme damage. I watched a few java language training videos on the internet and I associated what he mentioned as a class with the knowledge I gained from the video I tried to learn the java software language in the videos I watched. But maybe what I'm reconciling is different from what the user is talking about. In a nutshell, I would like to learn such terms. Can you please me?