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Tips For Making Cabinets Square With A Circular Saw

A couple of days ago I received the following email from Catherine regarding cabinets that aren't square.

Hi,

I just found your site and love it. I'm new to woodworking and want to know what tools you use keep boxes square? I see a lot of 90 degree clamps out there and wonder if you recommend any of them? Also, what do you do if your project isn't square? How can you adjust it? Say a cabinet or bookcase for example.

Thank you, Catherine

In a follow up email I found out she's cutting her plywood with a circular saw and guide with pocket screw joinery. Since this is how I also cut my plywood I'm very familiar with the problems. There are four main problems that can cause your cabinets to not be square. In this article I'll discuss what causes cabinets to not be square as well as how to prevent them. At the end  I'll discuss what to do when things don't line up square.

I had planned to write a separate guide on how to buy a circular saw but Catherine's question brings up a lot of the points I wanted to address so I'm including that here.
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