2-Methylcyclohexanone can enolise toward C-2 or C-6. Counting every distinct enol tautomer, including stereoisomers (enantiomers count separately), the total is

Enolisation toward C-2 gives 2-methylcyclohex-1-en-1-ol, which is achiral and has no cis-trans isomerism in the ring. Enolisation toward C-6 gives 6-methylcyclohex-1-en-1-ol, where C-6 carries $\mathrm{CH}{}_3$, $\mathrm{H}$, C-1 and C-5, so it is a stereocentre and gives a pair of enantiomers. Total $=1+2=3$.