As a main jung I always wanted to play Udyr but I don't know how the champ function (build, maxing abilities, combos...etc)

The issue is that the first Hex box that I have opened had Spirit Udyr skin, but how does the champ works? Like do I build him tank or AD or AS, I mean we used to see AP udyr at some point.

Also he got some changes to his abilities few patches ago, what did they do exactly?

I think I should max Q then E, as for the build I guess half AD and half tank, or something like that. So any hints?