The rotating sound of the custom chain saw is unmistakable, and the use of it is an "inherent danger". In fact, data from the Centers for Disease Control and Prevention show that about 36,000 people receive treatment in emergency rooms for chain saw-related injuries each year.
Before you start using a chain saw, it is important to follow some rules. First, check the control device, chain tension, and all bolts and handles according to the manufacturer's instructions to make sure everything is in order.

Then, check that the chain is sharp and has sufficient lubrication.

When you are ready to start, place the chain saw on the ground-never start it directly. Open the tool at least 10 feet from the fueling area.

Do not smoke when refueling the gas chain saw. Use a funnel to pour fuel into the chain saw and never refuel the tool when it gets hot.
Other general safety tips include:

Keep the path of the chain saw unobstructed. Remove all dirt, debris, nails, twigs or metal pieces before cutting.
When transporting the saw on rough or uneven terrain, use the chain brake of the saw (or close the chain saw completely).
Operate the Straight chain saw only when you stand firm and put your hand on the handle.
Wear necessary personal protective equipment, including hand, foot, leg, eye, face, head and hearing protection.
Do not wear loose clothing when operating the chain saw.
Please note that branches under tension may pop out quickly when cutting.
Be careful not to let the trunk or branches stick to the saw.
Knowing that the saw may rebound, I have never saw it with a tip. If equipped, fix the tip guard in place.