Keith wrote:
"So how does energy flow through a point in the circuit where the
voltage or current is always 0?"

The "0" is the sum of two voltages produced by adding together equal and
opposite voltages in two waves which are passing through each other with
no effect on each other.

Conductors producing the volts and amps from the waves they carry are
actually "bucket brigades". Distributed inductance and capacitance pass
along charges in a travel direction, or in both directions. There is no
problem as charges moving in opposite directions swell and shrink
occupancy at certain spots on the line. They don`t overflow, and charges
moving in each direction, like Ole Man River, they "jes keep movin`
along".

Best regards, Richard Harrison, KB5WZI