Webbing is typically cut with a 90 degree, “square” cut. But there’s no real reason to do this.
Instead, cut your webbing at a 45° angle. This gives you a bit of a pointy end, making easier to tie any sort of a rewoven knot, like a water knot or a double fisherman’s (preferred).
Making this angled cut is a lot easier if you’re getting your webbing at the climbing store, and they have one of those nifty hot knife tools. Just ask them to do it for you, even if they give you a funny look.
Below - 90 degree “normal” cut on left, 45 degree cut on right. 45 is better!