some mutations are good and will help you fight of certain diseases and defense against different weathers and circumstances. this site shows good proof of these occurrences even backed up by other sites.
When a genetic disorder is diagnosed in a family, it's always a worry of inheriting it so they have put a good description on how it works and the chances come out to a 50/50 chance.
there are substitution, inversion, insertion, and deletion i used this website since it clearly states what they are how and what it does!
there are different types of mutations hereditary and somatic which occur in two different ways one is inherited from there parents and others are affected by environment. i used this since it says and describes the steps required to cause a mutation.