My betta turned into a fuzzy thing that barks!

Jk, lol. I think my puppy is getting a little jealous of me taking pictures of the fish instead of him. So I'm just spreading the love.
I do have a question though, I'm making a little book for my cousin on how to care for a bettas for when I give him a betta as a birthday present, sort of a help/info guide just in case he forgets anything. I have the following included: water changes, feeding, what to look for if he gets sick, length the light needs to be on, and temperature.
Obviously I'm forgetting stuff. My mind is going 800 directions at once, what am I forgetting to include in the book?