How to loop multidimensional array in a template

I have data like this

[fields] => Array
(
    [title] => Array
        (
            [0] => Hary Potter
        )
    [url] => Array
        (
            [0] => books/2005-08-05-hary-potter.md
        )
    [tags] => Array
        (
            [0] => Hary
            [1] => Potter
            [2] => Hary Potter
            [3] => Book
        )
)

what should I do to loop the value of tags in a template html?