Last week I uploaded a video on the Null Hypothesis to the YouTube channel. This video on the Alternative Hypothesis, is the 2nd of 5 on the larger concept of Hypothesis Testing. There is some redundancy between these first two, because one can't fully discuss the Null Hypothesis without addressing the Alternative Hypothesis and vice versa. And redundancy and repetition are helpful when you're trying to understand a concept.
The Alternative Hypothesis is one of those statistics concepts on which experts disagree. Many include it as part of their recommended approach to Hypothesis Testing. Others are strongly opposed to its use. I think it's very useful for two reasons:
Andrew A. (Andy) Jawlik is the author of the book, Statistics from A to Z -- Confusing Concepts Clarified, published by Wiley.