How do I create a shortcut to another file or folder inside a folder? How do I create a shortcut to another file or folder inside a folder?

Example:

Suppose I go to a folder A /storage/sdcard0/pictures. I know that I have another folder B /storage/sdcard1/music. I want to create a shortcut inside folder A that point to folder B such that when I click on the shortcut, it goes to folder B.

I would appreciate if the answer is not about creating a shortcut on your home screen because this question is about creating a shortcut in a folder, not on the home screen. Thank you.
For the benefit of future visitors, Android's /sdcard is an emulated storage, not the real filesystem. It doesn't support symlinks (what you call shortcut).

See this answer for details.