Why would the Smart Quotes be in the Substitutions submenu of the Edit menu when that’s where it is in most other Apple programs?
The setting is in two places for a reason: you change your long-term preference for the default in Preferences; you toggle the setting on and off temporarily using the Edit menu without having to dig in the Preferences menu. You’ll find that’s a regular pattern for such settings.
Collections: when you highlight the collection in the binder, there is a minus sign next to it, which will ‘de-collect’ it.
BTW: There is absolutely no need whatsoever to give people money for tutorials, when there is a built-in tutorial which comes free with the program, and which you are recommended to use when you open the program for the first time.
The issue is this: Scrivener is very flexible and powerful — there is a reason why it is so widely recommended and why so many published authors swear by it — but it is designed round a few concepts which aren’t in standard Word Processors. These concepts give the program its power — if you ignore them and try to use Scrivener as if it were Word, then you’re just not getting the benefit from it.
The tutorial will only take you an hour or two to complete (less if you skim through it just to get the main ideas) and at the end of that you will have a good understanding of what the basic concepts and workflows are. Collections are one of those basic concepts, by the way.
So, seriously, the best thing you could do now is go to Help > Interactive Tutorial… and follow the instructions.
Read the documents START HERE and Key Concepts and then work your way through the The Basics folder. Most of what you find confusing now will become clear and you’ll be able to start getting the best out of the program very quickly — because, once you’ve got a grasp of these basic concepts, Scrivener is actually set out very logically in a way that is designed to fit round how you work. But you do need to understand those basic concepts first.
If you have any questions after that, please ask on here – there are plenty of experienced users who will try to help.
Hope this helps.
 I’m not saying that some aren’t good in their own right, just that the built-in tutorial takes you a long way to understanding how the program is designed and how it will work best. To coin a phrase… PRO TIP – don’t spend any money until you’ve tried the free stuff which is specifically designed to do the job.