How do I put worlds into the save folder?

There are some good tips in Increase Concentration While Studying.

While I'm unsure of your OS, you could try storing the 'A' folder and the 'B' folder in another folder called 'AB.' Then, when choosing a directory, you can narrow...

You don't -- you edit the option.txt file and then save that. If you're not sure how to do that, there are plenty of guides online that can help you...

Yes, those are only example songs. You won't harm anything if you choose to delete them.

With Outlook, you can export out folders at will. Go to File -> Open/export -> Import/export -> Export to a file -> Outlook Data File (.PST) -> You can then...

MCEdit will not affect your existing worlds, unless you purposely edit the world in MCEdit.

You put the folder in Minecraft and restart the game with task manager. Then play offline.

You can't save over auto saves. You have to create a separate manual.

Yes, you can. Make sure you use MS Paint. This can only be done with a Windows computer.

Try using GitHub.