welcome to the forum!
het is short for heterozygous, which basically means the animal is carrying one copy of a gene and it is not visually expressed. double het means that your snake has one copy of two different genes (i.e. Albino and Piebald), both of which aren't visually expressed. you have to take a breeder at their word when it comes to hets, hence why you should always buy from a reputable breeder.
you can read more about genetics here.
as a new keeper with two new animals, are you aware of the Quarantine Process? it is vital for anyone who owns multiple reptiles to practice quarantine with any new animal. if you have any questions, feel free to ask.
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