How do I know if my dog needs socialization?

So far every saturday he goes to this puppy class in a park and plays with a few puppies and adult dogs and also meets new people. The sundays are to go to some place where dogs are allowed, we usually go to a store or a cafeteria where I just order and go sit outside. On the weekdays when I’m able to we go to any park that’s near our house in the car, I just make sure that there aren’t strays in the area and there he sniff everything, watch people in bikes or scooters, makes holes and things that dogs do I guess. Two weeks ago we started some obedience training outside so he can spot the neighbors and cars, kids etc and not only go out for his potty train. I’m also planning a trip to the beach this weekend so he can meet the ocean. But he still is a pretty excited puppy when meeting people or going to places, he is starting to listen more when we go outside but it’s a challenge.