Any electric saw can be dangerous if you do not consider safety precautions while using them. Wearing safety gear such as closed shoes (to avoid severed toes) and eye protection (to avoid wood splinters getting into your eyes) can help in ensuring safety for your body parts during heavy construction work.
But wearing safety gear is just one part of the precautions involved. If you can afford to buy or create a nice, improvised structure that you can use as a guide while sawing or cutting, not to mention using the right instruments for each task, the better in ensuring safety.
Circular saws, when used properly, can make your cutting tasks much easier. It can help in avoiding blisters caused by manual hand saws and the muscle pain associated with it. There are tons of tips and techniques available to make this happen, and one of them is creating a cross-cutting jig.
source: Log Lab
Move on to the Next Page video: SIMPLE Circular Saw Cross-Cutting Jig.