The first one has to do with the number 0 (zero).  It’s super common that people when speaking will use the letter O in place of the number 0.  “What’s your phone number?”  It’s five-five-five oh-oh-two-three.  “Oh” is a letter, NOT a number.  Saying the word zero requires 1 more syllable. Don’t be afraid to say it.

Another often misused word is ton.  A ton is a unit of weight equal to 2,000 pounds, NOT a word intended to indicate you have “a lot” of something.

“I have a ton of friends.”  Really?  What’s that like?

Because I have 1,374 pounds of friends.