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
Pick up Item
You pick up an item from the ground. If it's a weapon, you can immediately equip it.
Equip Weapon
This action includes drawing or sheathing a sword, as well as switching to a ranged weapon.​
Dash
You get a second movement action.​
Reckless Attack
You make a fast and reckless strike. You perform a standard attack but you roll a d12 instead of a d20. You cannot use Reactions until the start of your next turn. If you have an advantage (or disadvantage), you resolve it normally.​
Assist
You support an ally who will act immediately after you. When you use Assist, you must:
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Be adjacent to that ally,
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Choose them as the next to act
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End your turn immediately (so it’s usually best to perform your Main Action first).
That ally gains Advantage on their next test on their turn. To make things interesting, instead of the ally rolling an additional 1d6 dice: you make the roll.