Betta Fish: finally got my betta!

I just got my betta on the 10th from a pet store, i’m still new to betta fish. I’m honestly not too sure if it’s a boy or a girl cause it wasn’t on its jar in the store. It seems to be doing fine in the tank i have but it keeps swimming on the sides of the tank and the front, I heard it’s called glass surfing but i’m not sure if its that or if its just still getting used to its new surroundings! I tested the water and everything looks fine with the kits that I bought. If anyone could give me advice on anything to add to the tank or more plants maybe, I wanna try and fit another hiding place into the tank. I have a 5 gallon at the moment and will upgrade eventually! i’m open to name suggestions because I have no idea what to name him/her. The rubber bands tied to the rock is just temporary as well until i get gel to just glue them onto the rock!