>>82812301NTA, but my ESL fren, it is not simply a spelling mistake nor is it minour.
It is a syntactical and grammatical mistake that makes the sentence look like it was composed by a 4-year old. What you tried to say is (If you don't get it[...]), which is a pronoun, instead you wrote (If you're don't get it[...]), which is a contraction of a verb and its pronoun (you are).
While CERTAIN LANGUAGES count contractions as 1 word, English is not one of them, making this a grammatical/syntactical mistake and not a spelling mistake. This knowledge might be useful to you in the future if you have to write essays in English, it certainly was for me. I hope you can understand more chuubas in the future fren, don't give up on your learning journey!