How can I achieve smooth and seamless joints in wood without using a jointer?

One way to achieve smooth and seamless joints in wood without using a jointer is to use a table saw with a dado blade to create a dado joint or a rabbet joint. These joints can help align and connect pieces of wood together securely. Additionally, using a hand plane or sandpaper to carefully smooth and level the edges of the wood before joining them can also help create a seamless joint.