D&D 5e has actions, bonus actions, and reactions. People frequently also use the term move action when talking about the kinds of actions you can take during your turn.
However, a “move action” isn't a kind of action in D&D 5e. This misconception seems to have come from carrying forward experience from D&D 3.xe and 4e, which do have move actions.
How can it be best explained and cited that there's no such thing as a move action in D&D 5e, when someone makes this common and understandable error?