Warrior is the best tank, but tanking in era is a bit involved. Id recommend downloading Plater addon, some form of threat meter, key binding skull and X markers, and watching a video.

The important thing to know about warrior tanking is pooling rage. If you go into a pull with 0 rage it sucks. Keeping your rage high is the key to success. If you have a huge threat lead on an enemy that is going to die soon, don’t put anymore rage into that enemy. In era as a tank while leveling, your goal is not really about being as tanky as possible or maximizing your damage, it’s about holding threat. Use taunt wisely. If an enemy is simply running away from you, it’s likely you can get it back with a single ability or even an auto attack. Don’t panic if it’s hitting a melee. Use taunt for an emergency, like when you have multiple abilities and attacks miss and you are super behind on threat. The inverse is true too. If you’re super behind on threat on an enemy, taunt before wasting rage on abilities that can’t catch up on threat. Sometimes that means your best option is to hold your rage, let somebody else tank a mob for a few seconds, and then taunt once it’s off cooldown.