I have to be a good teacher because if I was a bad teacher, children don't like me. At the other hand, If I was a good teacher, children like me. It makes children study hard.

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Thank you for making your homework, Eric!  Yes! That is correct. ^^ But, let us fix your sentence construction, so it will be clearer. Anyway, this homework of yours is great! Keep improving. Teacher is proud of you.

~ I have to be a good teacher. If I will be bad, children will hate me. On the other hand, If I show them goodness, they will  like me and they will study harder.

Let's avoid redundancy in your sentence, Eric. When we say redundant it means you keep on repeating the same word. See you in the class. Take care always.  ^^

~Teacher Cassie