English prepositions in and at, at the beginning, in the beginning

Engish prepositions can be a pain in the ass, sorry for my choice of words, but this is the closest deffinition possible :) Let s study IN and AT in the phrases in, at the end and in, at the beginning. p. s. I am on vacation now in Germany. But I will try to post videos as often as possible My channel My group My facebook group