Alpha Hydrogen acidity comes from the ability to resonate negative conjugate electrons onto the nearby carbonyl group. Your professor may ask you to memorize pKa values. I recommend UNDERSTANDING this chart as explained in the enolate video so that you're not left fumbling for numbers.
TATA says
Thank you from Thailand. I try to study Organic Chemistry and it has Enolate reaction, then I found your video in Youtube. Thank you for your video. Love you <3