Let’s say we have a bunch of shapes selected, and we’d like to distribute these evenly horizontally. First we’d go to the mini toolbar and click the ‘Align Top’ button there (third from the left), and then to even out the space between these layers, go to Arrange > Distribute > Horizontally.
Okay, but what if I just know that I want these layers 10px apart from each other? Distribute Horizontally won’t help here as that would just space them apart in the available space. That’s where Sketch’s ‘Make Grid’ tool comes in handy. Click the first icon in the mini toolbar (the one with the four squares), and you’ll see a sheet pop down.