Underline the Errors in the Following Paragraph

Underline the errors in the following paragraph. Then correct the errors by rewriting the paragraph.
-Brian, and Ethan took a class on personal finance because you needed to know how to take care of your personal finances. He was especially interested in learning how to balance his checkbook since he kept bouncing checks and could never get the balance correct. Since it suggest that you should start your retirement plan early, all three wanted to know how to invest his money. James, Brian, and Ethan even learned how to pay his bills online. Even though all three learned a great deal from the course, he learned the most since he can now balance his checkbooks.