Oil from pan
Engine oil can seep through the drain plug...
Antifreeze
Leaking antifreeze often leaves crystalline deposits like those shown
Attention! Most automotive oils and fluids are poisonous. In case of contact with skin, wash off immediately, and in case of contact with clothing, change clothes.
Oil under the filter
...or from under the oil filter
Brake fluid
Wheel leaks are almost always brake fluid
Advice. The smell of a leak can tell you what is leaking. Some liquids have a specific color. To determine the location of the leak, it is helpful to thoroughly wash the car and place a clean sheet of paper under it overnight. Be aware that some leaks can only occur when the engine is running.
Transmission oil
Transmission oil can seep through the cuffs on the inner ends of the axle shafts
Power steering fluid
Fluid may leak from the piping connections on the steering box