When you have toddlers at home, you have to be very careful. You have to keep away all dangerous things away from their reach. It may not be possible for you to always keep an eye on them. They might escape your eye for just about a minute and in that minute, can endanger themselves.
You should not leave any sharp object like the saw blades or other tools around. You should not leave any poisonous materials like the pesticides on the floor on the bottom of the shelves that is reachable to them. Do not leave things that they can turn over them. Keep cleaning materials away from their reach since they all have acids in them. Keep lighters and matches away.
Make sure he is surrounded by toys and is blocked to go very far away. Leave an area for him to play and block the area with things that he cannot move. Do not leave knives or sharp object down. If your switch boxes are very low, then tape them and close them so that he does not put his finger inside the hole. It is very tedious to take care of children at this age. They are very curious and would want to explore everything.

