It's not essential by any means but winning in Fortnite oftentimes comes down to whoever has the higher ground.
Arguably, this could be an intermediate-building skill, but new players to Fortnite should learn this skill. It's not essential by any means but winning in Fortnite oftentimes comes down to whoever has the higher ground. When you do need to retreat though, fall from a ledge and spam the wall build button followed by a floor.