Do jinn take the form of snakes and kill a person if they are not warned three times before being killed? Is what is stated in the article correct, that jinn are of three types: a type that flies, a type that are snakes and dogs, and a type that settles and travels? And how does one kill a snake when it is seen, especially if it is from the jinn?

We have previously explained the ruling on domestic snakes and how to deal with them, as well as the forms of Jinn. The article from which the questioner quoted some parts is generally correct. It discusses the issue of using salt in Ruqyah (definition), which some scholars have permitted, such as Ibn Jibreen and Ibn Ibrahim Al-Sheikh, while others, like Ibn Uthaymeen, have prohibited it. The most accurate view, in our opinion, is to avoid it, as there is no record of the salaf doing so. However, if its benefit is proven through experience, and the one who performs it or reports its benefit is trustworthy in their religious commitment and truthful in their reports, then there is no harm in it.