This useful tool can be used safely if you know what to do (and what to avoid).
The first thing you do when preparing to cut a board is to make a mark for the cut. About 90 percent of the carpenters I know make a mark with a speed square and cut on the left of the line sometimes and to the right of the line other times. Who knows?The small straight mark on the right is the exact place you want the blade to cut and is the correct way to mark a board, the wing mark on the left of the small mark is the waste side.
An example of dangerous sawing: pulling the saw (straight toward the operator) with no support under the plywood.
Get some Wite-Out and paint the wide prong side white (wide — white). This is the white (neutral) wire in the cord. Then you won’t have to look each time and try to figure out which way the prongs fit.
I marked on the back of my saws the depth of cut plus one-eighth inch. 1 1/2 inch is actually 1 5/8-inch depth of cut (to be sure it cuts through the thickness of the board). This saw is set for a 1/4-inch cut but the actual blade depth is 3/8 inch.