Tips for frying french fries?

I saw the recipe of Mummychunk for Smash Burgers and was thinking of
trying it out tomorrow.  I am also thinking of trying to fry some
french fries for the 1st time.
What oil temperature should I use?  I went to the state fair and asked
one of the famous vendors what oil they use and they said Peanut oil?
Any other tricks to get the fries nice, beautiful and crispy???
Thank You