I like Holidays because it is fun. My favorite  Holiday is Christmas. I like Christmas because I get presents. I also like  Halloween. We don’t do trick-or-treat but we give and get candys so I like  Halloween. I like many Holidays.

  Student's sentence            Corrected sentence            Grammar explanation          Better sentence     

Student's Sentence: I like Holidays because it is fun.
Corrected Sentence: I like holidays because they are fun.
Grammar Explanation: Use they are because holidays is plural. Also, common nouns like holidays do not need capitalization.
Better Sentence: I like holidays because they are fun and exciting.

Student's Sentence: We don’t do trick-or-treat but we give and get candys so I like Halloween.
Corrected Sentence: We don’t go trick-or-treating, but we give and get candy, so I like Halloween.
Grammar Explanation: Use go trick-or-treating for the activity, and candy is usually an uncountable noun. Commas help separate ideas in a sentence.
Better Sentence: We don’t go trick-or-treating, but we give and receive candy, so I enjoy Halloween.

Better Paragraph
I like holidays because they are fun and exciting. My favorite holiday is Christmas because I get presents. I also like Halloween. We don’t go trick-or-treating, but we give and receive candy, so I enjoy Halloween. I like many holidays.