"You are holding it wrong".
The only reason to know this seems to be because someone has told someone it seems.
There is no indication in the design of the element, and IIRC not even a subtle glow when you mouseover.
Sorry: as much as I like Apple I don't waste my time on their software. Not saying it is bad but for me I had to admit it was a waste of perfectly good working time and focus.
If you like it: good. I know people who seem to be more productive with Macs. And more Apple users is good news for both Linux users and Windows users since they force companies to think cross platform and force Microsoft to be more humble.
It's okay to have to be taught some things, it makes it better for pro users when the handholding is minimal.
Here's another one: hold alt when a menu is open to see some options change into alternate versions. Instant feedback, works on dialogs too. Keeps the UI uncluttered for noobs and power users alike without significantly impeding you.
HOW is Cmd+Up NOT an obvious shortcut for going UP one level? As I said, Cmd is already the primary modifier key for all app-specific shortcuts.
On the other hand, what does Windows use? BACKSPACE! A key people associate with deletion and editing text!
> Hold down option to change the right click menus?
Option modifies shortcuts, changing their behavior. "ALTernate." Again it's a behavior that's consistent across all macOS apps.
> Explorer is terrible but it's better than Finder because you don't need to read a manual
You don't need to read a manual for Finder, or almost any macOS app, because you can just click on the Help menu, and type the name of a command or action you expect that app to be able to perform, and it will automatically highlight the menu which contains that action:
http://i.imgur.com/HNUNqpN.png
I just typed "path" in the Finder help menu and it showed me the shortcut for "Copy as Pathname" including the Alt/Option modifier. And that works in EVERY macOS app. Try doing that in Windows!