Can you modify Lua files on the client if it doesn't affect the server?

I’m going to be modifying TTT files later, some of you might of saw in my recent post, but if I’m modifying them in a way that it doesn’t affect the server, can I get in trouble for that?

Editing files on your client will not affect the server at all, server sends you a copy of every necessary clientside file from the server.

Okay, thanks!