I have a question Aaron. In The Complete Beginners Handbook page 46, it states "The Output Section of
the circuit is shown in
RED in this diagram.
So, the collapsing of
the magnetic field in
the Main Coil (MC) is
the power supply for
the Output Section.
With the Transistor (T)
turned OFF, the only
pathway left open is
through Diode (D2)
and around to charge
up Capacitor (C).

The circuit shows me (D2) flowing away from (T). Which is it please. Opposite direction of arrow.

Thank you for your help