Are you familiar with the memory palace technique?
If not, you might want to take a look at this:
For the information you described I would definitely use a memory palace. It basically works in the same way as I memorize laws, here’s how I do it:
For the titles, subtitles etc. I find an image that represents that level (so I can have a structure and don’t confuse titles with the detail information).
For me when I memorize laws the main-titles are always represented by a Dr. Pepper can (that doesn’t necessarily have to make sense to you, but it makes sense in german (sort of) since a doctorate is called a Doktortitel)
then I just add the keyword of the actual title.
So for example:
On the first location of the memory palace, I’d have a giant Dr. Pepper, a heart (image for “Health”) and someone with a yellow safety vest (image for Safety). You could make it more detailed (maybe add a “manager”), but for me that would be enough to remember the title “Principles of Health and Safety Management” and that it’s a main title. Then on the next location of the memory palace, the first subtitle is placed (with the image for the subtitle level and the keywords) etc.
Example:
Location 1: Main title (image for level of title and image for keyword)
Location 2: subtitle 1 (image for level of title and image for keyword
Location 3: detailed information (just image for keywords that represent the information)
Location 4: detailed information
Location 5: detailed information
Location 6: subtitle 2
Location 7: detailed information
… etc.
So if you just want to go through the subtitles, you can look for the image that represents subtitles (Locations 2 and 6 here) without having to go through all locations.
You don’t necessarily have to use one big memory palace for everything, you could also make a lot of small ones, each for their specific subject.
Please let me know if my explanation wasn’t clear 