How can I open quickly a file in emacs?

Question

I have a very complex and dense structure of folders and files. I would like to open a file which is very far away from my home quickly in emacs.

C-x C-f

Answer 1

I'll also mention filecache.el. It basically provides a specialized completion (which you can bind to a key for use when entering file names) which first completes on "filenames, regardless of directory", and once that is complete, cycles through the few directories where such files are found.