What are the two major types of cells found on earth

Prokaryotic and Eukaryotic Cells.

Prokaryotic cells are the simplest (arguably) cells, in being that they have many less organelles inside.

Prokaryotic cells have a cell membrane, DNA, ribosomes, and a few other things.

Eukaryotic cells, on the other hand, are much more complex. They have many organelles, such as the endoplasmic reticulum, vacuoles, the golgi apparatus, and others.