I think the most important thing is the effect theory (the famous ones are agenda setting, dependence mode, knowledge gap and silence spiral). Followed by the audience theory (magic bullet theory, two-level communication theory, etc. )

There are control theory, media communication theory and content theory. (gatekeeper theory, mimicry environment theory, etc.). )

In short, there are many theories. I don't know where you want to classify them. I suggest reading Guo's Communication Course.

I hope my answer is helpful to you!