I was browsing through naruto wiki, and came across this page
It is stated that ,
They are not to be confused with kekkei genkai, as technically, hiden techniques can be taught to anyone.
By "they", it means Hiden Jutsu. Is it true that they can be taught to others? Is there any evidence of this happening?
I remember in the Boruto movie that the Shadow Jutsu is used through that advanced gadget. But is it possible for a person who does not have any clan relationship to learn a Hiden Jutsu?