Which of the myths do you think are actually not myths?

Which of the myths do you think are actually not myths?

1. Submitting to the search engines is the way to get listed
2. Meta keywords are the key to optimization
3. Stuffing keywords into alt attributes helps your page to rank well
4. Keyword stuffed comments give your page "an edge"
5. Page Rank is a measurement of where my page will rank
6. Rankings are the only goal worth measuring
7. Hiding outbound links will help me to rank better by keeping all my link popularity on my site
8. Elvis is not dead
9. Images are bad for SEO
10. Optimizing for generic words is a great idea.
11. It matters whether you have spaces or commas in your Meta keyword tag, and you will be penalized for using the same word more than 3 times
12. Every page must have exactly 250 words on it to be properly optimized.
13. There is a perfect keyword density and if you could only get it right, your page would be #1 for that term.
14. Hidden text is a great way to increase your keyword density.
15. The home page of your site should be optimized for every possible relevant term.
16. Your "site" ranks well for specific terms. (Pages rank for terms, not sites)
17. Google owes you a #1 listing cause you followed all their rules.
18. Everything you put in a header tag is given more weight by the search engines.
19. Google is personally out to get you, and they are messing with your head cause you experimented with invisible text.

Which one of these factors, for example, are just Search engine optimisation (SEO) myths and which are useful factors or recommendations to consider for SEO-friendly website design:

1. Website Age
2. Website Size
3. PageRank
4. Age of Webpage versus Age of site
5. Age of Webpage versus Age of site
6. Keywords included in Domain Name
7. Keywords included in Title Tag
8. Keyword included in Body Text
9. Number and Relevance of Incoming links
10. Keywords included in Description Meta Tag
11. Keyword Density in Body Text
12. Keywords included in Keyword Metatag
13. Keywords included in H1, H2 and H3 Headlines
14. Keyword included in anchor text
15. Keyword included in alt tag of linking images
16. Keyword prominence to the top of the webpage
17. Keyword synonymous presence in the body text
18. Keyword proximity
19. Keyword Font Size
20. Links to external leading reference pages for targeted keywords
21. Content Freshness
22. Less than 100 links per webpage