the very secret of cardboard cutting is a sharp blade, but also, there are several tips you can find useful
My favourite paper knife is Olfa with metal tip on other side (amazing tip for removing excessive hot glue on seams) plus black blades.
Metal ruler is much more durable than plastic ones. You would like to have 12in and 36in. Cork backing is a nice extra feature.
Non essential but very useful tool. It helps to check corners and align your work, level the shelves and the ruler is very convenient to use when you work with small parts.
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It is easy to cut cardboard along the ruler, but you may have issues with the backside of cardboard it has a tendency to jam and to become torn on edges. To avoid that cut in 2-3 light cuts. If you have thick cardboard you need to make more cuts. If you want to cut in one move put your cardboard near the table edge and cut with a long blade all way through the cardboard surface sawing up and down.
Cutting circle can be a real challenge especially if you need a lot of them to make a bunch of strong wheels. But circle cutting tool is something that you can easily make using cardboard itself.
Paper bleed may be trick to cut at first but I have found it very useful in a cardboard crafting.
