How to deal with 17month old tantrum!? Be it anything .. How do we stop her doing something dangerous or dirty?

Firstly, stay calm. Do not react the same way because it will fuel the tantrum and there will be no end to the chaos. What you can do is to take your child to another room or a separate area and hold her close. Keep rocking her back and forth in your embrace and let her calm down. I realize that this works the best because sometimes, all a child needs is to be held.