I want to go Kyeong Joo in Korea.
Because, there is a lot of relic of shinla era.
and a lot of my friends went to Kyeong Joo.

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Emily : I want to go Kyeong Joo in Korea. Because, there is a lot of relic of shinla era.
Correct : I want to go to Kyeong Joo in Korea because there is a lot of relic from Shinla Era.

Explanation : You can join the sentence with the first one because it supports your first sentence. 'Shinla Era' is a proper noun that is why it should be in capital letter. We use 'from' because you are saying that those relics came from the Shinla Era. And lastly, you forgot to put the preposition 'to' before the word Kyeong Joo. The use of 'to' here is to indicate the place of something.

Emily : and a lot of my friends went to Kyeong Joo.
Correct : And, a lot of my friends went to Kyeong Joo.

Explanation : When we use 'and' at the beginning of a sentence, we put a comma (,) after it. And, it should start with a capital letter. :)

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Hi Emily! I'm happy you did your homework today.  You had few corrections today and I hope you will take time to read it. I'm now curious on what Kyeong Joo looks like. I hope I can also go there with you. :) Anyway, good job with today's homework again. Keep it up!

~Teacher Louise