Drum Synthesis in Sytrus - Xenowave

This tutuorial is gold

killer resources for learning fm synthesis

javelinart.com's guide to fm synthesis of real instruments.pdf
The chipsynth md manual has an excellent diagrams to help you wrap your head around picking the right alg to get the sound in your head
Porta FM manual breaks down 2op fm
Ctrix's Deflemask tutorial breaking down 4-op fm de mystifies the genesis SSG-EG retrigger env shapes which is gold
Diode Milliampere's synth clap tutorial in Ableton Operator
Brainpalace's VOPM tutorial. VOPM is soo good
Navie D's Sytrus Tutorial
FM in Schism Tracker