I don't know of any videos, but Bob explained it pretty well above.

The dry signal directly from the Track (including track FX) is sent to the main Out

The AUX send dial on the mixer can send any amount of any Track(s) to a set of plugins in any AUX slot(or multiple different slots). These get added to the Main Out using the Output control of the AUX slot for the volume. Note that usually any FX in the AUX slot will likely want to be set to 100% wet so you aren't adding more dry signal from there inadvertently.

Example use:
You have individual drums on 8 tracks.
Set the AUX Send dial on those 8 tracks to send to one AUX slot.
Add a single Reverb in that slot.
Now you can control the reverb sound & volume for all 8 tracks from one spot .. yet still control how much of each drum get sent using the AUX Send dials, so you can adjust each drum, but they are sharing a reverb and thus sound like they are all in the same room.

I made a drawing of the RB routing a long time ago, but have lost track of it.
I'll look again.

I do not work here, but the benefits are still awesome
Make your sound your own!