Replying to How to count flips 🤷‍♂️

Where should I start ? I come from Agressive Skating and some things make no sense to me.

a Bio 540 it’s clear but a double bio 540 would be a 900 right ? Bit the spin is just a double flip with 540 ? And if we count double it should be 1080 right?

same with switch tricks what means the opposite but switch backflip would be then a frontflip 🤷‍♂️ that’s why Bladers call it Fakie cause we ride backwards.

so double flips it’s a double bio 540 plus a 360 ? For the flip ? Wich is not really a 360 🤷‍♂️
sorry I am maybe to old with 42, can someone help? Thank you all