They should watch animation, acton  and comedy.
>They should watch animation, acton (action) and comedy.
~  This sentence is correct just be careful with your spelling.

Because animation is fun. Comedy is too. Action is a little scary.
> Because animation is fun as well as comedy, while action is a little scary. 
~ You mentioned that animation and comedy are fun so let us make it in one sentence.
~While is a conjunction.  We used it to join some words in a sentence.

Some kids like to watch animation movies. But we should not watch violent movies.
>Some kids like to watch animation movies but we should not let them watch violent ones.
~Let's us try to avoid redundancy.  Redundancy means keep on repeating the words in our sentence.

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Hi Eric!

      You committed very few corrections for this homework. Keep it up! ^-^
 You are doing great but don't forget not to lose focus in the class. Don't be distracted and always take the chance to learn more.

>See you and take care always.

~T.Cassie ^_^