Reaction score is how many “likes” on your posts that you have received also counts the other reaction options too. I just gave you a like so now you have 1 for a reaction score. Points is just basically awards for posting or receiving likes or something which you probably also just got since I gave you your first reaction. The points don’t really mean anything. To me is just fun to have I like keeping track of stuff like that. I really do like the reactions as well so that way you can acknowledge and not have to reply.