Understanding what "het" means is the biggest part of understanding pieds and albinos.
there are 3 kinds of morphs.
Recessive: morphs in this category require both parents of the breeding to have the gene in order for their babies to "display" the morph. Sometimes a snake can carry the gene but not show it. This is called heterozygous or het.This would look like a normal but would have the potential to create babies that show the morph if paired with another het. (EX: het albinoxhet albino=albinos, normals het albinos)
Codominant: this is when 2 snakes of the same morph can be bred to create a different looking snake or "super". Codominant snakes can be bred with normals to produce a possibilty of morphs (ex: pastelxpastel=pastels, super pastels and normals)
Dominant: works like codominant but there is no super form. (spiderxspider=normals and spiders)
Hope this isnt too much to digest. I tried to simplify it