Quick actions are very fast and usually simple actions that do not require a success check. They do not directly affect enemies or other creatures with the exception of reckless attack.
Interaction
These are actions that involve interaction with another object or creature that do not require a d20 roll.
Reload
Use this action to reload a weapon such as crossbow.
Drink Potion
You get the potion out of your inventory and drink it
Aid
You help an ally with a simple task. The ally gains advantage to all tests until you perform another action. To make things interesting, instead of the ally rolling an additional 1k6 dice: you make the roll.
Equip Weapon
This action includes drawing or sheathing a sword, as well as switching to a ranged weapon.
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Dash
You get a second movement action.
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Reckless Attack
You can make a very fast but much less accurate attack during a quick action. You roll a d12 instead of the standard d20 when making an attack roll. If you have an advantage (or disadvantage), you resolve it normally. You also cannot use reactions until your next turn.
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Ready
Your next reaction is free. You can use it throughout the entire combat.
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