Enough already Structure of enols and enolates

The stabilization of ana-p dicarbonyl compound through hydrogen bonding and resonance. 

Tautomerization doesn t occur without an a-hydrogen. Most ketones do contain one or more a-hydrogen atoms, so they undergo tautomerization These ketones exist in equilibrium with the enol form. In most cases, the ketone form predominates at equilibrium, but in a few cases the enol is particularly stable and it predominates. 

Keto-enol-tautomerization is not resonance. The ketone and enol forms are different compounds that are in equilibrium. 

---