Today I made my breakfast in the morning, I hadOPTION A: Today I cooked some some eggs and dumplings for breakfast in the morning. OPTION B: This morning I made some some eggs and dumplings for breakfast.

In the afternoon, I went to dance class.(NOTE: The comma is optional)

I felt exhausted after the class, as I hadn't danced for quite a long time.N(OTE: You safely delete the word "the" to make the sentence more succinct.)

Later on, I had dinner with my sister at thea restaurant near our home.

It' was my first time atrying thisat restaurant, and the food was unexpectedly good and I ate a lot.

It's my first time trying this restaurant, t. The food was unexpectedly good and I ate a lot.

Today I made my breakfast in the morning,; I had some eggs and dumplings.

There are various ways to do it (with a semi-colon, a dash, etc.), but you need to break these two parts up because you have two subject + verb pairs.

Later on, I had dinner with my sister at thea restaurant near our home.

This is very small, but "the" restaurant makes it seem like there is only one restaurant near your home. Maybe that's true, and you can ignore my correction :).

It' was my first time trying this restaurant,; the food was unexpectedly good and I ate a lot.

this breaks up the subject+verb pairings.

About mMy dDay

How' has your day been?

Today, I made my breakfast in the morning,. I had some eggs and dumplings.

It's my first time trying this restaurant, t. The food was unexpectedly goodamazing, and I ate a lot.

How's your day been?

“How’s” is fine in American English. See here:
https://www.collinsdictionary.com/dictionary/english/hows

Today I made my breakfast in the morning,. I had some eggs and dumplings.

Later on, I had dinner with my sister at thea restaurant near our home.

“A” is more natural since you haven’t mentioned the restaurant before.

It' was my first time trying this restaurant, t. The food was unexpectedly good and I ate a lot.

About mMy dDay

I felt exhausted after the class, as I hadven't danced for quite a long time.

How' has your day been?

In casual English, you might hear someone say "How's your day been?" But it's technically incorrect, because the real phrase is "how has your day been" - whereas "how's" translates to "how is" - which is not grammatically correct.

Today I made my breakfast in the morning,. I had some eggs and dumplings.

You could say "made my breakfast" but it's more natural to say "made breakfast"

I felt exhausted after the class, as because I hadn't danced for quite a long time.

More natural.

It' was my first time trying this restaurant, t. The food was unexpectedly good, and I ate a lot.

"It's" = "it is"
Since this is past tense, you'll want to say "it was"