But what I didn’t talk about yesterday is the biggest aspotrophe catastophe of them all, which is the confusion between:
“ITS” and “IT’S”.
1. “It’s hot today.” = IT IS HOT TODAY = APOSTROPHE FOR LEAVING OUT A LETTER
2. “I have a new car. Its top speed is 120 mph.” = POSSESSIVE = THE TOP SPEED OF IT. = NO APOSTROPHE FOR POSSESSION
A great practice page here from better-english.com.