Want to learn how to professionally fit bikes, what courses are there? and which are considered to be the better ones?

Sign up to any course that doesn’t start with ‘knee over the pedal axle’.

anyone else with advice?? preferably useful

http://www.retuluniversity.com/

Cyclefit do them.

I think that is useful advice : )

So do I…..
Also avoid ones where they put their elbow on the nose of the saddle to measure reach..