A situation of using notebooks that always puzzles me is when you want to point out a certain "code block" with your collaborators: since the notebook is not organised in a pure text format, the code pieces cannot be located with line numbers.
How can we precisely locate the position of a certain piece in a notebook?

CellTagsare probably the way to go. – Kuba Jun 06 '16 at 17:23Ctrl+Fsearch. Or NotebookFind. – Kuba Jun 06 '16 at 17:25Cases? – sunt05 Jun 06 '16 at 17:28Casesyou have in mind? – Kuba Jun 06 '16 at 17:30