At/in beginning/end?

[hugsandkisses]

at the beginning
at the end
in the beginning
in the end

Identify each and please provide examples.

[Anglika]

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.