If the rabbits are very young (I’m guessing based on your other post), they will need to be separated at puberty and neutered. It’s very likely they will start fighting when they hit puberty (around 12 weeks of age), as babies cannot form true bonds. Once they are neutered you can go through the bonding process with them. You can read about the bonding process here: https://binkybunny.com/infocategory/bonding/. Also be aware that young rabbits are very often mis-sexed, so separating at 12 weeks or before is a good strategy to prevent an accidental litter. Separating before you see any aggression will give the best chances of bonding, as rabbits can definitely hold grudges.

(As an aside, I also recommend checking out the other sections in the Rabbit Info section as you are new to bunnies https://binkybunny.com/house-rabbit-information/).

In terms of you bonding with them, most rabbits hate being picked up, so it’s best to interact with them on their level. Hand feeding is good, but be wary of too many treats. Spending lots of time on the floor with them and mostly “ignoring” them is a good way to earn their trust. As prey animals rabbits get nervous if they feel like they are being watched too closely.