I go to a programming class (C#) and I'm learning a lot about coding with C# but the problem is that They don't teach me all the codes and commands.
So my question is,:
Is there any website or application like sololearn that can teach me more system commands?
For example where can I Learn to write a firewall?
I don't know all the codes and commands to do that
Well there are many websites and applications out there on the google and app store . You can just search for them , if you find any of them helpful for you or if you feel comfortable with any of them you can choose it . Moreover if I talk in the other way by taking my point of view , PDF and YouTube channels are best for learning all those commands . And there are many PDF out there which will make you aware about all those commands be it in any language . If you find difficulty finding those I'll suggest you a youtube channel - "NEWBOSTON" and for PDF you may refer to this :-