>>1226897>I am looking for an EXTENSIVE online course or website or resource to fully master adobe photoshop.They exist but are payment courses. The instructor also assesses your progress along the way and you get active feedback. You stated you don't want open source or hipster online courses. So that means professional online courses.
If after all your rejections of everyone's suggestions, you resort to rejecting the professional online courses in Photoshop, then you are NGMI as everyone else has said.
As for serious photoshop use where you do draw on the layers, you will need a video drawing tablet. It's far more natural to draw directly on the image itself rather than with a stylus as you are glancing on a monitor. A URL below shows an example of what I am talking about. Wacom makes a better one, but there is nothing like drawing directly on the illustration itself as that is more natural feeling.
https://www.walmart.com/ip/BOSTO-16HD-15-6in-LCD-Graphics-Drawing-Tablet-with-Practical-Accessories/135045422 