Discord sometimes says whether someone is playing a game e.g. Fortnite or something. What else can Discord see? So you can only see if someone is playing a game or if someone is on an "ominous" website (I'm a QUESTION FOR A FRIEND)? Can you possibly make out this feature?
No you don't see everything and yes you can change it in the settings.
Yes, you can exhibit. It can also show what you hear on Spotify once you connect your Discord account to Spotify.
You can issue the feature in the settings under "Game activity".
PS: Nothing is shown what you do on the Internet.
No, Discord only looks at which programs are running and displays those that it knows as games. So you could add your browser manually, but you would only see that you were doing something in your browser, but not what.
In conclusion: No, you can't!
No. Discord only shows which program you currently have open. You can easily change this function in your account settings!