You can move at any time during your turn (before, after, or during actions).

You can take a bonus action only when a special ability, spell, or feature states that you can do something as a bonus action.

A reaction is an instant response to a trigger of some kind, which can occur on your turn or on someone else's.

Conditions alter your capabilities in a variety of ways, and can arise as a result of a spell, a class feature, a monster's attack, or other effect.