OF is used for POSSESSION – Who does it belong to?
▶️ A friend of mine
▶️ The president of the company
(=the company’s president)
▶️ The color of that car
(=that car’s color)
FROM is used for ORIGIN – Where did it come from?
▶️ I’m from the United States.
▶️ This T-shirt is from Mexico.
▶️ I got this book from the bookstore.
(It is now MY book, but its origin was the bookstore)