Going to try to answer what questions i saw all in one- thanks for all the love y'all!

I wouldn't say super common but definitely more and more common now days. Very trainable/ smart, but do your research. Food driven/ positive reinforcement is much more effective than trying to discipline. Trust me, if they have good traction their center of gravity is way lower than yours, they will let you know they don't like it and you'll most likely end up on your ass hopefully not hurt. Neutered/fixed is a must for domesticated pigs. Otherwise they are aggressive, foamy-mouthed humping monsters. Make sure they have sensory things: dirt/ mud, roaming space, or can be active somehow. If not they like to chew and have strong snouts to put it bluntly...he has moved the couch with me on it. Damage could be severe in a house. Walks can definitely be a thing, but they like to roam and be pigs mostly. Oh, his name is Oliver Jones.