What are the mistakes we commit while doing SEO?

There are a few mistakes we can make while performing SEO for a website.
Some of them are

  1. Not building internal links.
  2. Not aligning content with search intent.
  3. Ignoring technical SEO.
  4. Expecting overnight results.
  5. Creating backlinks in low domain authority websites
  6. Not creating a canonical tag for the webpages
  7. Keyword stuffing in the meta description
  8. Spamming while creating backlinks

What are the other mistakes you do while performing SEO?

Well, I have facing problem related off page backlink. Do you know best submission site where i could do my back link