Conventional current is most common way to measure current. Measurements are taken from more positive side of the circuit to the more negative side.
Conventional current is not the direction that electrons actually flow, but somewhat confusingly it is the opposite direction. This has to do with the chronology of scientific development. Ben Franklin, yes that Ben Franklin, conducted electrical experiments in a time when the existence of an electron was not known or understood. He theorized that TKTK from positive to negative of a circuit. It wasn’t until TKTK and TKTK that the electron was discovered and scientists realized that Franklin and everyone else had current flow backwards.