https://helpx.adobe.com/lightroom-cc/how-to/get-started-lightroom-cc.html

https://www.youtube.com/watch?v=8preKExixUI

The first link is a solid starting point.
The second link is an example of someone who is blowing smoke and does not understand how Lightroom's Catalog works.

You do NOT need to organize your files at the folder level in Mac's file browser - the organization and management tools INSIDE of Lightroom are far more powerful and comprehensive. I use a simple chronological order to my folders, by year/month/day. The primary tool inside of Lightroom would be the "collection" - the so-called "masterclass" uses folders to organize - and avoids the use of keywording and collections. If you set up a category for Iceland, but in that category there are sub categories like birds, thermal springs, landscapes, seascapes, street photography etc. each of which would have its category. So do you make those categories and make duplicate images for each? That part is nonsense. Better to do that virtually so that images can be part of multiple categories without having to duplicate images. His method is very idiosyncratic. Organizing by date AND using a descriptive folder title lets you search in Lightroom either by date, content, keywords, etc. But you should wrap your head around these two links to see what makes sense for you.

Another thing I do is use a custom preset to change the filenames on import - I use the original camera-assigned title, add a date, camera serial number, and an import-based numbering system for that specific import session - to make it as unique as possible. This way if you have multiple cameras, or if your camera rolls over from 9999 to 0, there is little likelihood that one filename will be shared by two or more files.

STOP! Do not waste your time reading anymore responses. This is an example of the first advice being the best.(Also known as the “Law of the initial maximum” in experimental physics.) I have not yet looked at either link but the message here is do not consider organizing your files into folders at the operating system level. It simply does not matter! Collections are the key tool.

I could go on several confusing pages justifying the advice. I will avoid that because it will only reveal that I am not a brilliant author. I have a stack of Power Point slides that I could use to convince you in an hour. Or at least get you to leave.

I will respectfully disagree with you about Terry White - he is not blowing smoke. I am a PC user, but that is irrelevant. There is absolutely nothing wrong with organizing a folder structure outside of Lightroom, then importing as shown in the video. That way you have absolute control of the naming of your folders and the method you use. Some people use dates, others use categories, but that is a personal choice. One is not necessarily better than the other. I use dates (year-month) to organize my folders outside of Lightroom (pre-importing), and I may have subfolders with categories if necessary. But I know that not everyone wants to do that.
I agree with you about Collections - I use them a lot, and I also use keywords. However, I don't suggest that people who use a different method are wrong. Choose whatever method you feel comfortable with. There is no one way of naming or importing that must be used by everyone.
One of the great things about Lightroom is that there isn't just one way of doing things, and Terry even said in his video that his method worked for him, and he would not criticize someone else for using another method.
I prefer my way of doing things, you prefer yours, but that doesn't mean that one of us is wrong.