Bonus action is one type of Resource available to characters during their turn. Bonus Actions can be used to execute various abilities, such as Shove, Hide, or casting certain Spells.
Characters normally receive one Bonus Action per turn. Thief Rogues receive two Bonus Actions. Some magical items, such as Circlet of Fire, conditionally grant an additional bonus action.
Common Bonus Actions
Class-Specific Bonus Actions
Barbarian
Frenzy
Frenzied Strike
Rage
Rage: Bear Heart
Rage: Eagle Heart
Rage: Elk Heart
Rage: Tiger Heart
Rage: Wolf Heart