What are the three places compression can be lost in an engine?

Compression in an engine can be lost in three main areas: the piston rings, which may wear out or become damaged, allowing gases to escape; the cylinder head gasket, which can fail and lead to leaks between the cylinder and the cooling system; and the valves, where improper sealing due to wear or misalignment can result in compression loss. These issues can lead to reduced engine efficiency and power. Regular maintenance can help prevent such losses.