Greetings all

I hope I make sense, as I'm seeking some guidance through this, please.
I'm trying to get to grips with some basic electronics.
I know and have learnt the electronic math rules
W = V x A ; V = IR , etc..

What I get stuck on is more "why would one use a capacitor
in a circuit, why not a resistor?"
I understand the functions that a part plays (sometimes not 100%
correct) but generally
eg:
capacitor: takes in energy (voltage) and stores it, until it is released.
Resistor: acts to slow down the voltage as like a form of friction.
much like one lane of traffic compared to a 4 lane highway.

But what I don't grasp is why do we place a resistor with a coil to make
a tuning circuit, why not use a capacitor. I'm trying to grasp what is
it about the resistor, that makes the two components work and thus form
a tuning circuit.?

For example:
If I take an FM Receiver and Transmitter kit (wireless microphone kit or
remote control kit), say I connect a 1 Watt power source to the
Transmitter, (in place of the human voice on the microphone kit)
what components will effect the Voltage and Amperage (v x a = W) in the
receiver side, and should it be the same +/- 1 Watt and what would cause
the decrease should there be a difference?

I thank you for your assistance up front,

Thanks
Barry