To answer your original question, there's a Macrumors starter guide that comes in very handy.
https://forums.macrumors.com/threads/132963/
The greatest difference you'll discover is how well everything is organized.
All your personal data, documents, music, photos, and preferences go to your User/Home folder.
Applications go in your HD Applications folder either by an installer or simply by dragging the application icon to your applications folder.
When the directions say to drag it to your hard drive, it still means that it goes inside your applications folder.
You don't need to buy anti-virus or anti spyware apps at all.
Set-up is a breeze and do run your system " as shipped for a bit just
to rule out any problems.
Add RAM! 3rd party from either Crucial.com or macsales.com
Apple +/- zooms the text in web pages. Still my favorite!
Buy AppleCare before your factory warranty expires.
If you get stuck, someone's usually here 24/7