There is loads of great content on YouTube to take you through skills development. Here is a selection of some of the basics.  GCN, Bicycle Network and Liv Cycling have some of the best explained skills tutorials.

Great How to Articles

The 10 Commandments of Training - a great summary of the principles behind "how to get better"

https://www.active.com/cycling/articles/the-10-commandments-of-training-879626

How to Draft - Liv Cycling has a great How To series, and this one is a simple yet well-explained tutorial on drafting

https://www.liv-cycling.com/global/campaigns/how-to-draft-on-a-road-bike/21873

How to Corner on a Road Bike - excellent description of line, speed and braking

https://www.liv-cycling.com/global/campaigns/how-to-corner-on-a-road-bike/21772

How to Descend - Another one from Liv Cycling - the correct body position for confident descending

https://www.liv-cycling.com/global/campaigns/how-to-descend-on-a-road-bike/21996

How to Hold Speed through corners (descending through corners)

https://www.liv-cycling.com/global/campaigns/how-to-attack-corners-faster-on-a-road-bike/22580