These videos will help to improve your handling skills.
Here's a free mini-course from professional handler Allison Foley taking you through the basics of showing your dog. leadingedge-dog-show-academy.teachable.com/p/handling-minicourse
Ring Patterns: A primer of various ring patterns and mistakes to avoid, taught by professional handler, Will Alexander.
The No Fuss Stack: Will Alexander shows you how to hand stack your dog with minimal fidgeting.
Free Stacking: Another of Will Alexander's videos showing you how and when to use the free stack.
Leads: A Will Alexander video teaching how to choose and use a show lead.
Doris Boyd Handling Seminar: Although this video shows her working with Bulldogs, the tips she gives apply to all breeds.
A Day with Professional Handlers: This is a fun video about a husband/wife pro handler team in Canada