You've already gotten lots of good advice, particularly from CHG_CANON who, IMHO, is the resident Lightroom Classic expert.

Only a few things to add - One, don't be very worried that you'll mess things up with Lightroom Classic. Every visual change you make to a photo is recorded in a separate file so that the original photo remains unchanged. (Note that changes to EXIF data, like keywords or dates are recorded in the physical file.) It is possible to delete a photo permanently, but when you ask Lightroom to delete a photo, it will ask you if you want it deleted from the disk drive or just removed from the catalog. If you do the latter, the photo remains on your disk drive but you just won't see it in Lightroom Classic. You can always import it into Lightroom Classic again later.

Two, and this repeats what others have said, your actual folder structure and naming conventions that you use on your disk drive for the folders and files is not very important. The only situation under which that becomes important is if you were to stop using Lightroom Classic because then you will need to rely on that folder structure to find a particular photo.

And, lastly, Lightroom Classic gives you many orthogonal ways of organizing your photos. By orthogonal I mean that each way you organize is independent of the other way and each way you organize is hierarchical in nature. The first one of these is the actual folder structure. But because there are so many other ways to organize, it becomes less and less important. Another way to organize is to use Collections. Although a photo can be only in one physical location, e.g., a folder, it can be in many Collections. Collections can be grouped together into Collection Sets so that they also behave in a hierarchical fashion. Another way to organize is through keywording. Keywords can also be hierarchical. For example, I have a geographical set of keywords with countries at the highest level, then states or provinces, then cities, and in some cities particular buildings. As a result, when I assign the keyword Philadelphia to a photo, it automatically also gets the keywords Pennsylvania and USA. Finally, you can use Labels (shown as colors) and Stars to organize photos. How you use them is up to you. The advantage of these two organizing tools is that using them is very fast, a click or two per photo. Say I want to pick out 10 photos to send to someone, but I have several hundred to choose from. If I'm not currently using the yellow label, I might use that and as I browse through the several hundred candidates on my first pass, I can quickly label a subset with yellow. Then I filter to see only the yellow labeled ones and discover that I've still got 23 candidates. Now it is easy to compare these 23 with each other, and remove the yellow label from the ones I rule out until I eventually get down to the 10 I want.