Check me writing 3

Are there any mistakes in my writing?

Dictionary is very crucial when learning a language. It contains over thousands of unknown words. Also, there is a thesaurus: a book that contains a list of meanings for (or of?)each single words. Words on the list has the same meaning. There are two types of dictionaries: bilingual and monolingual. Bilingual dictionaries has a word meanings in foreign languages while monolingual dictionaries has a word meanings in that language.(Any writing suggestions? It,s sound repetitive)However, using monolingual dictionaries can be a tricky task for beginners. It is good to start with a bilingual dictionary, if you are an absolute beginner.

Doing homework might be the hardest task for some students. It depends on their teacher and the amount of homework they get. Most students think that homework is absolutely waste of time. This might not be true for some reasons.
From my point of view, homework is not always waste your time; Homework is a set of exercises teacher assign (or order?) us to do, to recap the lesson we have learned and again it depends on the teacher. Some teachers give us a homework that will be used on their exam so we have got to do it; otherwise, we will be failed on the exam.