There are four main types of editing: developmental, line, copy, and proofread.
Developmental editing is the first and most important type of editing. It is also the most expensive. Developmental editing focuses on the "big picture" elements of your book, such as plot, characters, pacing, and structure.
The second type of editing is line editing, which is also known as stylistic editing. Line editing focuses on the details of your writing, such as sentence structure, word choice, and voice.
The third type of editing is copy editing, which is also known as mechanical editing. Copy editing focuses on the technical aspects of your writing, such as grammar, punctuation, and spelling.
The fourth and final type of editing is proofreading. Proofreading is the last step in the editing process and focuses on catching any final errors or typos.