What are the very first types of bridges?

Log bridges: These are the simplest and oldest type of bridge, made by placing logs across a river or other obstacle. They are still used in remote areas today.

Beam bridges: These bridges are made of beams, which are long, horizontal members that support the weight of the bridge. Beam bridges can be made of wood, stone, or metal.

Arch bridges: These bridges are made of arches, which are curved structures that transfer the weight of the bridge to the ground. Arch bridges can be made of stone, concrete, or metal.

Suspension bridges: These bridges are made of cables or chains that are suspended from towers. The weight of the bridge is transferred to the cables or chains, which are then anchored in the ground. Suspension bridges can be very long, and they are often used to span large rivers or valleys.