Amino Acids are catergorized characteristics
Amino Acids (ex. Aspartic or Glutamic acid): They have a carboxyl group on their side chain that can donate a H+
Amino Bases (ex. Lysine, Arginine, Histidine): They have a nitrogen group on their side chain that can accept H+
Non-Polar Amino Acids (ex. Tryptophan and Glycine): They have lots of hydrocarbon bonds that are non-polar on their side chains.
Polar Amino Acids (ex. Serine): They have hydroxides, disulfide, and/or NH2-C=O group on side chain.