Problem $2$: Partial Derivatives, Gradient gradf, Divergence div$(f),$ and Tangent Plane

I'll now provide an example similar to what you might see.

Example Problem

Find the gradient gradf, divergence div$(f),$ and the equation of a tangent plane for:

$f(x,y)=x^{2}y+3y^2$

at the point $(1,2).$

Please solve and explain all parts will leave like