I might be wrong, but I think the error is the way they spelled okay. When you are writing in an essay or any other forms of writing, I think you’re supposed to spell the word out instead of abbreviating it.
I hope this helps :)
OKAY BEST ANSWERRRR ISSS ASAAAAPPOO
Explanation:
An answer for this is:
"The world is very very big!
There are so much mysteries!
There is so much fun as dangerous things! More and more things you learn about world and its complexities, more and more things you understand that you don't know about them! But... You will never understand it completely!