How to connect two exhaust fans in the kitchen, two blue lines and one yellow wire?

If the 4 wires of the wall wire box are standard electrician wiring, there should be one less red live wire, blue is the neutral wire, the yellow and green double color (one line is half yellow and half green) wire is the ground wire, and the 2 yellow wires are the controlled live wires of the original switch output, which are the power live wires that go to (supply) the two bulbs respectively.

There are three wires of the exhaust fan motor, brown, blue and yellow, and yellow should be a yellow-green two-color line. It's ground. The black and white power supply can be connected to the brown and blue colors of the fan motor.

Yes, but conditionally:

If it is a single-pole air switch, you can share a neutral wire, if it is a two-pole air switch, you can't share a neutral wire; >>>More

According to the first photo, there should be four or three wires (there are two wiring methods); >>>More

Fan, black with blue wire. The red capacitor of the fan is connected, and then the yellow wire is connected, and the other capacitor does not need to be moved.