There are many ways to make wood stronger. One way is to add a protective layer to the wood. This can be done by adding a sealant or varnish. This will protect the wood from moisture and wear, and will also help to prevent cracking and splitting. Another way to make wood stronger is to add reinforcement. This can be done by adding metal brackets or plates to the underside of the wood. This will help to distribute weight evenly and prevent the wood from breaking under stress. Finally, you can also make wood stronger by using denser woods such as oak or maple. These types of woods are less likely to warp or break than lighter woods like pine or cedar.