Whether playing PC, mobile or console, there are dedicated build controls - defaulting as Q on a computer keyboard, or B on Xbox / Circle on PlayStation - however getting your controller scheme and settings in order first is important.
Whatever platform you're playing , if you are using a control then the fortnite items first thing you are going to need to do as soon as you've mastered the basics of building is to change over to'Builder Pro' control layout, which may be done by going into Settings > Wireless Controller > Setup.
The new design can take a little getting used to, but once you've become accustomed to it, you'll discover that it gives you an edge over opponents who aren't utilizing it throughout combat as it allows to get a quicker build output.
Furthermore, it's well worth hopping to the sport settings and turning out two items if they are not already active - Turbo Building and Automatic Material Swapping. The former lets you hold down the fortnite materials fire button to continue to build items fast ('painting' them ), whereas the latter means should you run out of a substance, it is going to jump to the next available. Both are excellent during a firefight, once you're more concerned with getting something assembled than what it's made of and the exact composition. https://www.youtube.com/watch?v=P7gQAKoJlK0