Find one of them in the open, away from raptors and other predators, also, make sure you have a lot of berries or Rockarrots. Put wood walls around it when it’s knocked out so you block out small predators that attack you or the Stego. It might take a bit but you can still tame it.
They're good for raiding. Tame a bunch, level their health and use them to drain turrets.
1. They have lots of health
2. They have damage reduction, so they'll take less damage from the turrets.
Low level ones can get about 5000 thousand health and higher levels can end up with around 20000 health.
Other than that high level ones can do decent damage and they have a knock back effect with their tail.
Their saddle is cheap to make.
A lot of people say they're not any good, but I think they are underrated. Yes the tame process is long, that's probably the only con.
Stand on a tall rock and tranq it or make a dino pen if it's easier.