The Mac is generally more consistent than Windows with multiple ways to do what you want.
1. In all Apps: Menu > File > Save > click on New Folder button
2. In all Apps: Menu > File > Save > right click on existing Folder in Save dialog > Duplicate
3. In all Apps: Click on the File name at the top of your window > Move/Rename
4. In Finder: Menu > File > New Folder or command shift n or right click > New Folder
5. In Finder: select File/Folder > Menu > File > Duplicate or command dor right click > DuplicateorOption Drag
6. In Finder: Right Click on a File/Folder > Copy/Paste or command c/vor right click > Copy/Paste
Just about everywhere you see a File or Folder, click once to select it click again to select its name and change it.
Have a look through the Menus of both Finder and your Apps and you will find they are very consistent (so worth learning) and generally very clearly labelled.
Pay attention to what the Menus are called and what they do.
1. Apple menu which has everything to do with your Mac and macOS.
2. App menu where you find the About, Preferences etc
3. File - What it says, creates new files/folders, Saving, Printing, Set-up, Quitting etc
4. Edit- What it says
5. Insert - What it says
6. Format- What it says
7. Arrange- What it says
8. View - What it says
9. Share - What it says
10. Windows - What it says
11. Help - What it says
Keyboard shortcuts for Menu items are next to the item and usually consistent so also worth learning.