"Conventional" current is the way we understood and labeled electrical current before we discovered that the actual charge carriers (electrons) carry negative charge.
The electrons ... doing all of the actual work to make current ... flow from the negative terminal of the power source to the positive terminal, but we still give them no respect. Wherever the direction of current is shown on a schematic diagram, it's "conventional" current. It begins at the positive terminal of the power source, and at every point in the circuit, flows toward places that are more negative.
Conventional current flows from positive to negative.