What you learned in school
Physics textbooks taught conventional current flow from positive to negative terminals as the actual direction of electrical flow. Students learned to draw circuit diagrams with arrows showing electricity moving from positive to negative. This was presented as the physical reality of how electricity moves through wires and components.
What we know now
Physics classes taught conventional current flow from positive to negative terminals, and students learned that this represented the actual movement of electricity. This was presented as the physical reality of electrical flow. Electrons (which carry electric current) actually flow from negative to positive - opposite to conventional current. The conventional current direction was established before the discovery of electrons and has been maintained for consistency in electrical engineering. The actual charge carriers move in the opposite direction to the conventional current arrow.