No Armour
Abilities that don’t require an action, bonus action or reaction, such as something that increases your armour or enhances an attack.
Abilities that take require an action, bonus action or reaction.
Counters that determine how many of a thing can be done between rests. Some replenish after a short rest, some require a full day.
Spells that don’t use up spellslots. A spellcaster’s equivalent to attacking.
Levelled spells. These consume spellslots of that level, unless stated otherwise.