IN / AT the BEGINNING / END

What's the difference between ...?

- BEGINNING

• At the beginning (of) = it's used for the time and place when something begins.
• In the beginning = at first and it suggests a constrast with a later situation

- END

• At the end = it simply refers to POSITION at the end of something. 
• In the end = it suggests that something happens after a lot of changes, problems or uncertainty. 
• We made eight different plans for our holiday, but in the end we went to Brighton.