How do you make a concrete beam?

To make a concrete beam, first, create a formwork using wood or metal to shape the beam. Next, mix concrete by combining cement, water, sand, and aggregates, then pour the mixture into the formwork. Reinforce the beam with steel rebar for added strength, ensuring it's properly positioned within the concrete. Finally, allow the concrete to cure for several days before removing the formwork, ensuring the beam has achieved adequate strength.