The basics are quite simple, and they are all you ever really need to
know.
1) Fewer watts for every mph
2) Fewer heart beats for every watt
3) Less effort on every beat
These basics define the ultimate goal for every cyclist, no matter what
body type, no matter what natural talent, no matter what level of
training.
This is true the first time you get on your bike and forever
after.
If you get these basics squarely in your head and keep them in mind at
every turn while using an objective repeatable reference to track your
progress, you will be able to figure out the rest.
This book will help get you started.