I am a total beginner and have been researching (yeah, I am an engineer...) this topic for the last almost 3 months.
My first piece of equip is on its way, an oxy con 10LPM!
I found this e-book,
https://www.etsy.com/listing/9956183...?ref=hp_mod_rf
on etsy, that is very nice! Clean and neat, with great description of the basics and great pictures.
I didn't see any comments for it here so I thought I would share.
A bit expensive, in my opinion, but it was worth for me.