In English 101, you will absolutely be writing essays.
You may also wish to check out these collections of lessons on Source Materials, Revising an Essay and Reading and Understanding Essays.
They can be used as supplemental resources to your textbooks.
Consider checking out these video resources on Grammar Help and Writing to help you master conventions in writing.
You'll encounter lessons on punctuation, clauses, verb tense, sentence structure, clarity, diction and a whole lot more.