In this case, there is data in the documentation: just read SpecialFolder and you will get where on the target platform the folders are (just read and forget this paragraph).
On many things, the programming is similar / Xojo do the things for each platform: you do not really have to know the target, just read the docs.
Unfortunately, as others wrote earlier, sometimes things are from similar to frankly different.
Human Interface Guidelines (an Apple original document that was many years ago published by Addison Wesley), available on line for free on all three OS platforms will give you ideas on what is usual for its platform.
Also, when I do not have an idea on a subject, I take a look at OS shared applications (TextEdit for macOS is an example).
The Resources folder is a Xojo thing (as far as I recall); I never saw that on macOS previously (prior Xojo / Real Studio / REALbasic).