You gain advantage on STR checks and saving throws (not attacks), +2 melee damage with STR weapons, resistance to bludgeoning, piercing, slashing damage. You can't cast or concentrate on spells while raging.Your rage ends early if you are knocked unconscious or if your turn ends and you havent attacked a hostile creature since your last turn or taken damage since then. You can also end your rage as a bonus action.
Starting at 2nd level, you can throw aside all concern for defense to attack with fierce desperation. When you make your first attack on your turn, you can decide to attack recklessly. Doing so gives you advantage on melee weapon attack rolls using Strength during this turn, but attack rolls against you have advantage until your next turn.