The most important part of learning boxing is studying pro or amateur boxers. From them you can learn new techniques , movement , learn their style or improve your own.
Here's a list of pro boxers you should definetly study and keep an eye on:
Vasily Lomachenko - master of footwork and creating angles
2. Floyd "Money" Mayweather Jr. - master of the philly shell , 50-0 record , legend.
3. Pernell Whitaker - ring genius , amazing technique and iq