at the beginning
at the end
in the beginning
in the end
Identify each and please provide examples.
Usages indicating specific time or place - "at the end/beginning [of the road]", "at the end/beginning [of the film]", though start would be more normal than beginning in these.
In the end = collocation meaning the final point: In the end, we had to agree.
In this usage, they are interchangeable:
At the beginning/In the beginning, God made the earth and all that is in it.
At the end/In the end, the world fell into darkness.