There are many ways to get around in Fortnite. Outside of using vehicles, most Fortnite players will intuit that it's quicker to move through the environment by either sliding or bunny hopping, but both of these can be augmented by adding ramps to close gaps while sliding and deploying platforms while bunny hopping to achieve greater heights.
Ramps themselves are often useful for vertically traversing to higher points for loot or snipping positioning, but also can leave the player vulnerable to pot shots from enemies at higher or lower positions. One way to address this is to build ramps in two layers to add an extra buffer between enemy players. Platforms are also handy not just for layers in a structure but also for rapidly building to break a fall if the rest of a player's building falls out from under them.
Traversal also encompasses putting distances between other players and two great ways to do that are to build in 2x2 structures in order to create more height and therefore distance from enemies in, as well as building somewhat erratically in order to create fake-out doors and ramps so that pursuers will get lost as they chase the player through a structure.