A2
helping you to do or achieve something
Dictionary examples:
The most useful skill: pretending to listen in boring meetings. (0.0)
The most useful invention: a pillow that does homework. (0.0)
A useful skill for students: invisibility during exams. (0.0)
useful information/advice (9.7)
A good knife is probably one of the most useful things you can have in a kitchen. (18.4)