What is the difference between dual bevel and single bevel?

A dual bevel saw tilts the head both left and right, so you can cut a bevel without turning the board around. A single bevel saw tilts one way only and forces you to flip the workpiece for the other side.

Can it cut wide boards?

The sliding head extends the crosscut reach beyond a fixed miter saw, so it handles wider trim and shelving. Depth of cut is still limited by the 10-inch blade, so thick stock may need two passes.

Is a 10-inch saw enough for crown molding?

Yes for most crown, especially when you cut it nested against the fence. Very tall crown profiles may exceed the saw's capacity and call for a 12-inch model.

Does it need a stand?

It is a benchtop saw and works on a sturdy table or a miter saw stand. A stand with extensions helps support long boards on the sliding rails.

What blade does it use?

It takes a 10-inch blade with a 5/8-inch arbor, the common size for 10-inch miter saws. A fine-tooth blade gives cleaner trim cuts than the general-purpose blade.