Rugby positions explained: who does what in union and league

Every rugby position in union (1 to 15) and league (1 to 13): what props, hookers, locks, halves, centers, wings and fullbacks do, and how to find where you fit.
Rugby union vs rugby league: the differences explained

15 players or 13, rucks or the play-the-ball, 5 points or 4: how rugby union and rugby league really differ, where they came from, and why the Vegas Kings play both.