A lot of you have trouble with using a, an, the. The most common mistake is that you use "the" when it is not required. here is a good page that gives examples of it. PLEASE go through it THOROUGHLY - and bookmark it. Refer to it often when you write anything.

https://www.gallaudet.edu/tip/english_works/grammar_and_vocabulary/when_to_use_a_an_or_the.html