Simple - if there is only one layer of cells.
Stratified - if there are more than one layer of cells.
Squamous - flat, fried egg-shaped, nucleus is flattened and near the surface of the cell..
Cuboidal - cube shaped, as tall as it is wide as it is long, nucleus is round and at center of the cell.
Columnar - Tall and skinny, nucleus is elongated, stretched out and near the baseof the cell.