The Little Albert experiment has been included in so many psychologists because it provides empirical evidence of classical conditioning- the notion that responses are not automatic but are instilled through experiences.
The experiment used a small child to study its response to a furry animal by first introducing the child to the animal to see that there is no fear of the animal initially. The furry animal was then later introduced repeatedly following a loud noise. Eventually, the infant was classically conditioned to believe that he should be afraid of the animal.
It is important for newcomers to understand the findings of this experiment because it is the bases of studying behavioural psychology.