As noted yesterday, editing is important. Nothing ruins what would otherwise be a good story faster than typos, misspelled words, misuse of homonyms, poor sentence structure, too many adverbs, etc.
The first level of editing is your responsibility as the author. You will miss things such as typos and missing words because you will “see” what you expect to be there. One way to avoid this is to read your work out loud. That way you are more likely to focus on the words on the page and notice anything missing.
It’s also helpful for line editing. If you find yourself saying something different than what’s written, it is likely a hint that you should reword it accordingly. If it’s awkward when read aloud, it needs to change. A few of my books have been produced as audio books. In a few cases, my narrator caught some awkward sentences that were reworded for clarity, demonstrating how well that works.