What to feed my 5 month old..?

Okay Lol my son is 5 months. He has been on baby food since was 3 months ( please don't lecture me, he needed to gain some weight.. ) he does great with foods. In fact he's already had some stage 3 foods.. He loves the Gerber Graduates foods, like the puffs and wheels.. He has had pancakes ( no syrup ) I just gave him a piece to gnaw on.. My question is what actual foods can he eat? Like mash potatoes, bananas, etc..? He doesn't have any teeth yet.. But does "chew" on some things, when he wants to lol. Any advice ( POSITIVE only please ) would be appreciated!! Thankyou :]