There are a lot of side dishes on the table such as cooked potherbs, pickled cucumbers, cooked beans, soybean sprout soup, vegetable soup, kimchi, pickled garlics, cooked radishes, etc.

I sometimes eat cereal and milk. I enjoy fruit soup for breakfast. For digestion, thin rice gruel is suitable. I think I can improve the function of my stomach and intestines.
Usually in our country, people like to eat boiled rice and kimchi together with other side dishes for meals. I sometimes eat green peppers. I eat green peppers with soybean paste.

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I made up a passage for practicing English writing. Would you check the sentences and correct any errors?

It's all correct with one comma needed and a couple of suggestions:

Comma is needed after "table" in the first sentence.

Think about combining these two sentences to avoid repetition:
I sometimes eat cereal and milk. I enjoy fruit soup for breakfast.

And combine these two also:
I sometimes eat green peppers. I eat green peppers with soybean paste.

Let us know what you come up with, and we'll be happy to give you more feedback.

Sure, I'd be happy to help! Here are the corrections to your passage:

"There are a lot of side dishes on the table, such as cooked potherbs, pickled cucumbers, cooked beans, soybean sprout soup, vegetable soup, kimchi, pickled garlic, cooked radishes, etc. I sometimes eat cereal and milk. I enjoy fruit soup for breakfast. For digestion, thin rice gruel is suitable. I think it can improve the function of my stomach and intestines.

Usually, in our country, people like to eat boiled rice and kimchi together with other side dishes for meals. I sometimes eat green peppers. I eat green peppers with soybean paste."

Great job overall, just a few minor corrections.