To explain what a foundation morph is basically a morph you plan to build around. In ball pythons for year's most used Clown,pied ,or one of the Axanthic as a foundation. Now some are building around other recessive such as puzzle or sunset. In boa's many went around one of the albino strains or Anery. Why it's not every animal in the collection but you base heavily off that foundation. This way you can offer different combinations of this and you become known for having animals in a project so other's know to come to you when looking for this morph. For example you focus on TSK Axanthic and someone is building a group to make double recessive TSK clowns. They are likely to come to you for a combo that will work with clown. Currently most advanced projects are Double or triple recessive projects currently. In balls Hypo puzzle, ultramel sunset etc . In boa's Vpi leopard , Carbon VPI etc