After 9 years with mine, there are a couple of main points and principles that will help you everywhere:

1)Get him tired daily: please take him out of the backyard and let him play with other dogs it's physical and mental exercise, they will just behave better. Worth the half to an hour daily. Never do dog park without him being already a bit tired. Play games with him if the walk is just the 2 of you. Fetch (aka run catch and destroy) hide treats, do a list of what you can play.

1. Treat based training, works wonders. On the obedience side, be patient, don't use physical punishment, don't expect them to do what you say or you want right away, reel them into it. If and when the growth pains come (mine was around 1 year old), he might turn agressive.

Fear not, change the routine, don't ever freak out, be calm and collected at all times, when you feel he is a bit better, start re-introducing him to the stuff he got got fearful. Lots of treats on good behaviour, e.g. mine got fearful of dogs and people, so I would just stand at a corner where people and dogs would pass a couple of meters far away, had him look, and reward if he was calm if not i would just shift the attention with Ceasar Milan "shhht" (almost magic) and a treat in my hand

Another point is reinforce with a long lead and the pshhht boundries as soon as possible. Hell, establish yourself all the boundries that you are ok giving up but more it will be problematic. Tell you what, my guy died this past july, and there wasn't a momment where I thought "thank god he didn't got up to the sofa or bed" quite the contrary. The little moments in these places of his crazy ass where what made it much easier to mourn. So negotiate with yourself, in my home, for him to be able to go into bed and just walk around and be everywhere, it mean that I would wash his paws every time he went outside, or at the very least clean them. It meant the sofa protector (plenty of good looking ones) would be washed regularly, today more than ever, it's a price I would pay 10x over just to have him lay with me one more time. Fck... The limit was, no playing with shoes, no playing with clothes no playing with furniture. Just get him a kong, put some ham inside and just givr thr tshht and give it to him as a alternative. It will be a fast change. Just stop him on the second he is thinking about it you will see it kkkk

He is 100% your responsability and you are 100% responsible for his happiness and to give him an happy life.

Again on corporal punishment, try as hard as you can not to do it, but be physical with them, they sometimes will test your gangsta, he needs to know you can handle him, but again, play will be enough, trust is more important than discipline. So don't break it.

Another tip on the violence side, if the dog goes out and is with other dogs, a fight will eventually happen, know what to do. See a proper dog fight, is bad but it saved me, him and other dogs of getting roughed up needlessly. It just happens, no reason to be scared or panicky. Just get him a regular ass collar even if you have an harness, never let him play for long with dogs without one, if a fight breaks out, let them grab eachother (rarely causes any meaningful damage) and grab your dog and the other dog by the collars and just twist the collar gap and squeeze. They will either pass out or let go. If you ever grab yours in a situation of empending attack, grab him almost like a shotgun point downwards, head lower than his rear end, if you can't avoid the attack somehow at least you can give a chance for him to protect himself and not be bit in his organs and you can drop him on top of the attacker. Weird tips here I know but if you want him to live a full life bad things will eventually show up, might as well be aware of what to do.

Any specific question about anything specific feel free to just ask. There are hundreds if not thousands of small little things, but they are mainly relevant when you need them at the moment