Answer:
Amino acids are molecules with an amino group (-NH2), a carboxylic acid group (-COOH) and a variable group (X) that gives origin to around 20 different kinds of amino acids, you can see how the structure of an amino acid looks in the image I added.
A dipeptide is a molecule derived from two amino acids, as you can see in the image they form a bond between the amine group of one amino acid and the carboxylic acid group of the other one, forming a bond we call peptide bond, this reaction also produces a molecule of water.