Build 4 dino gates and place 3 down in a square formation leaving 1 side free, lure the dino into the gates and then add the last one trapping it in, if you fill the gates with doors you can get on top of the gates and fire down, it also helps as a wall for when you're taming it
For beginners these things will spot you in a split of a second so don’t even think of going up to it with a stimberry in your hot bar. Instead, get a ghille suit and sneak behind it and feed it a beer! Don’t use stimberries it is pain And time consuming unless you have a bush of stimberries. They eat berries after they are tamed though. Not beer.