What is the best way to remember the four macromolecules?

A useful approach is to learn each macromolecule by its monomer, its key bond type, its function, and its example. Carbohydrates have monosaccharides linked by glycosidic bonds, proteins have amino acids linked by peptide bonds, nucleic acids have nucleotides linked by phosphodiester bonds, and lipids are not polymers but include triglycerides, phospholipids, and steroids.