boxing mechanics that determine good technique for maximum effectiveness and power. How do feet placement matter etc etc. the science of boxing.
if you google "fran sands boxing" hes a proper boxing coach. He does charge for some stuff, but he has lots of free videos on his facebook, insta and youtube. He also has book, I havent bought it but his other stuff worth checking out.
The best instructional book on boxing ever is by Edwin L Haislet, it is called Boxing, I believe. You can read it for free online. Tom Yankello has, in my opinion, the best videos on youtube. There are a couple others that I like but I can't recall the names. Most of the boxing instruction online is junk.
Two books that have some good information are Boxing for Beginners by Al Bernstein/Ken Norton and the Jack Dempsey book, Championship Fighting. I like some of Kenny Weldon's You Tube videos. This link will get you to more videos. I think Weldon trained Holyfield for some of his fights. This content is protected
@greynotsoold is right Hasilet is the best one for the job… the terminology confused me when I first started years ago, if you wanted clarification on anything just reach out I think I basically understand it.
I don't think you could go wrong buying those Kenny Weldon videos. Weldon seems to be one of those guys who learned a lot during his time around boxing, and he knew how to teach what he had learned. Those reflex punches, (especially the ones using the right hand to block the right uppercut and the left hand to block the left uppercut), along with the counters are nice. Everything I've seen that Weldon taught was done with good body mechanics and foot placement. He noticed the little things that a lot of trainers don't see like pivoting the correct foot, not only for punching but for evasive moves.