
Most people are interchanging editing and proofreading as two points of the revision process. But, they are not the same thing, although both required close and careful reading, but they emphasized different angles of the writing process and utilized a different approach.
Editing
Editing is a challenging job after you finished your draft, you have to edit it. Editing lets you see whether your paper is compelling if there’s a smooth transition between paragraphs, and if your argument backs up with the evidence that you have. You have to reread your drafts for you see those things.
Levels on what you can edit:

Contents
Content editing, as the name suggested, means checking the content of your work. You will go into the contents for factual errors, inconsistencies, and contradictions. If you are working for a fictional paper, in content editing, you need to check the plot, character, or dialogue. Content editing lets you check whether if the theme adequately developed. Content editing is subjective than other forms of editing; it involves a lot of thought and decision-making.
Content editing assesses the content in detail.
Overall Structure
Structural editing is not about revising your work, but it involves making structural changes.
In structural editing, your goal as the editor is to check out the story’s overall flow, paying attention to the plot, dialogue, descriptions, characterizations, and any other unique components to the story or writing, before going into details like spelling and grammar.
Structure Within Paragraphs
A paragraph is a distinct section of a piece of writing, a group of sentences that all relate to one main idea or topic. Topic sentence, unity, coherence, and adequate development; these are the four main characteristics your paragraph should have for it to be effective.
A topic sentence is one of the most effective ways to attain clarity and unity in one’s writing.
Unity is essential because it assists the readers in following along with your ideas. One paragraph only deals with one topic; when a paragraph is written, your readers will expect a new topic.
When you switch main ideas or topics within a paragraph, it often confuses. You, as a writer, should display how the concepts involved in a paragraph are connected to the main topic.
Adequate Development means when the paragraph describes, defines, and upholds the topic sentence.

Clarity
Editing for clarity, your goal is having your sentence one interpretation only. To ensure your sentences are clear, you should use specific words, use active voice, simplify tenses, use Standard English, replace vague pronouns, avoid using the helping verbs (would, should, and could), and check for any misplaced modifiers.
Style
The style in writing can be characterized as the way a writer writes. It can also describe as the author’s “voice” that readers listen to while reading. In style editing, it will let you see if you use correct capitalization, punctuations, the proper usage of apostrophes, and the words that are easily confused.
Citations
Citation and Reference editing are essential to a paper, especially if you are writing an academic paper. References validate the information you write in your paper; proper citations also complete the paper’s progress.
It is vital to give proper credit to your sources – footnotes, endnotes, reference lists, and separate citing page.