First off, where are you located? Maybe join a riding club if any are in your area and ask the other members if they can help you learn. Maybe ask about one component at a time so as not to overwhelm anyone that will spend 15 mins with you but not 8 hours. I don't know if it would help but as you mentioned Videos and such aren't helpful to you so I think having the function of each part and how it works explained in front of you may help understand how to fix it. Something such as a rear derailleur is actually a very simple device once you see how it works but can be confounding to even experienced Auto mechanics if they don't understand what each part does. Hands on experience is the best teacher.