You can make crisp, accurate bevel or miter cuts with a circular saw but it’s tricky. The blade guard can stick, making it tough to get started. And because the blade is angled, it’s more difficult to follow a line accurately without twisting the saw

Making Perfectly Straight Cuts: One of the first things any woodworker is going to be faced with is making cuts, either by hand or with a power tool. It might seem like just diving in is the way to go, but there's some finesse in how to make your cuts

Using this proper cutting technique is not only a good way to achieve consistently accurate cuts it is also a safer way to use a quilting ruler and rotary cutter.