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In the beginning is usually preferred alone and followed by a comma. But at the beginning is used together with a noun such as year, book, century, show ..etc.. ;)
at the beginnig means at the start point of every task.a sentence or a phrase always follows this expression.
At the begining of the next week, i'll visit Mr. Anderson.
but if you say in the beginning, you can not add a preposition after it. you can say:
in the begining , Mary went to the cinema.
at the beginning vs. in the beginning 
Re: at the beginning vs. in the beginning 
Linear Mode
