I like to make things.
When a pattern requires you to fold the fabric in half before cutting, it’s important that it’s folded on grain. This means that the threads that make up the fabric are running straight across the fold, not at an angle. This ensures that you’re not accidentally cutting wonky pieces.
To fold on grain, first press out the manufacturer’s center fold. Then grab about a yards-worth of the fabric, holding the two selvages together. Hold the fabric up in the air, letting the folded edge hang down, and scoot the selvages back and forth parallel to each other until the fold edge is nice and flat. If the bottom fold edge is bunchy, not flat, or, for lack of a better term, “weird looking,” the fabric is not folded on grain. Keep scooting until it is. Once on grain, continue folding the entire piece, keeping selvages parallel.