Monossacharides & Dissacharides

It's only this year that I have learned how biologists write each structures of a monossacharide combining of the two to form a dissacharide. For me, it's really amazing how they were able to come up with it. I have learned that monossacharides are mainly composed of carbon, hydrogen, and oxygen forming with different positions such as glucose, fructose, and galactose. Forming dissacharides, on the other hand, is a bit complicated to learn but as you tackle/review covalent bonds it won't be that hard. I hope that I could memorize each of the monossacharide's structure in order to understand how to write a dissacharide structure in many different ways. Thank you once again for viewing and God Bless!