Not a boxer these days more of a Kali and Silat guy. Trained straight boxing for a couple of years then muay Thai for another 2.
All good advice above. I d add boxing is about hitting. If u want to train defence in a way that's going to progress you quickly look at:
Add combos. Sometimes u see a jab coming slip outside jab cross. Sometimes u don't. Catch the jab sidestep right as u jab. Sometimes the jab cross is really quick. Catch jab, party cross as u throw cross, left hook.
BTW if you want an unfair advantage Google jeet kune do - non telegraphic punching and progressive indirect attack. Used for attack not counters. Just be religious with your stretching those techniques need a lot of shoulder flexibility.
Always train moving off the line of the attack. if u stand in front of the guy there's no skill the guy with the highest pain threshold wins. Getting hit in the head gives u brain damage. It's proven no debate possible. That's y I moved to martial arts. Less head hunting and wider tactics. If a boxer comes at me I can kick, throw elbows, or hand trap or grapple. If an MMA guy comes it would be limb destructions, eye jabs, hand traps, chain punching, knife hands and Silat grappling (as it's not based on wrestling or Jujitsu).
There u go a year's training ideas in one post.