Connecting to my PC and Apple Devices via non apple router

Is it possible to have the airport express connect to a non apple router wirelessly?

Then is it possible to have it extend that range wirelessly to apple devices?

Then is it possible to connect my PC up to the airport express as well via ethernet?

So if it can connect to non apple router wirelessly, is possible to share that internet via ethernet as well as wirelessly?

AirPort Express

AirPort Express

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