Please explain what Direct and Indirect Object Pronouns are in simple terms. Are they interchangeable? What are the English equivalents?

Direct pronouns are the names of people or objects.

For example, if you say "The cube is green. The cube is also chipped on the cube's side."

Do you see the unnecessary repetition when you continue to use the same direct pronoun?

Indirect pronouns are it, her, him, them, etc.

For example, if you used different pronouns to make the sentence flow better as you went along as long as you addressed the direct pronoun first, the better sentence would look like this "The cube is green. It is also chipped on its side."

That flows a lot better.

Explanation:

I hope this helped!