tiktok affiliate program

my dad thinks that I can make money with the affiliate program eventhough I draw only fanart. how can I explain to him that I'm legally not actually allowed to make money through fanart? or is it ME who got things wrong and you can still make money with the affiliate program even if you draw fanart?
please explain it to me like I'm 5 years old of possible because I have 0 knowledge in this whole affiliate stuff. and yes I already tried to google any answers.