Getting some good materials or systems for learning about certain parts of the home and its hardware needs is easy these days. You could try out such things as online door hardware training, which is available on the internet. These are provided either by manufacturing companies or firms which deal in such things.
The door and hardware industries have their own experts who could give you some things which are going to help you in having some excellent stuff. They often take care to make videos and articles that are really relevant and helpful. You could have a number of these shared or downloaded for your own use.
There is no specific process involved here, usually because the training is not addressed as a formal part of jobs or training for these jobs. Also, the expertise here is often part of the general run of employees or experts who are in the field of hardware or specific to work on doors. This means that what you can have will not be systematized and you will have to do the systematizing yourself to get good traction on the details.
In any case, these are not hard to learn or understand. You usually have to see how these things are going to work, and how installs and step by step processes can go. These are details that are generic for this industry and these are also unique to the work done on products and the installations or parts of a structure.
The hardware used for doors are easily identifiable. They are among the most common of products, and the industry related to these is also well established. In fact, so prevalent and common are things like keys and locks, that people will not think of a home or use it without these gadgets and implements.
Such tooling is organic to doorways, which also needs handles, spy windows and other such features to improve usage. This is a typical thing inside homes, for office buildings, and commercial establishments. The hard stuff serves the most important parts or spaces that enable people to enter and exit a place.
That means training for handling the doorway features and gadgets is a tech driven thing. Any new improvement in tech is always incorporated if possible to the most common items. Things like doors therefore will have their share of digital electronics and remote control that are also getting more common.
Physical items can range from the simply lock and key, to electronically controlled ID systems that read retinal imprints. The security is important here, the doorways being the best way for anyone, legal or illegal, to enter a place. Online courses that take in all these or detail your lessons will certainly provide you with good traction.
While online lessons may not be systematic, the vocational course work can be. That means that they could also run their own websites for you. However, it works better to physically handle and manipulate the hardware to know how to work them.