Question

Which one is correct ?

Answer 1

AT the end of the journey / film / book / street / runway etc. When you say 'at' you are thinking of a point in time, or a specific place.

IN the end we decided to stay at home. IN the end the jury found him not guilty IN the end the staff managed to get a pay rise

If you use 'in' you are thinking of the end of a process, or an argument or a negotiation, rather than a point in time or a particular place

Answer 2

same goes for: http://languagelearning.guru/%E2%80%8B790/at-the-beginning-in-the-beginning?page=1&focusedAnswerId=806#806

Answer 3

I think they are the same and depend on the use of the word