Meta-data & page auditing; an effort worth doing?

How do changes to these various page aspects affect key SEO metrics (entrances)?

• title
• meta description
• keywords
• h1 element
• h2 elements
• # of links, internal and unique
• # of images and their attributes

Should changes to any of the above be audited and compared to traffic figures?

Sometimes I wonder whether I'm trying to be smarter than search engines, that's why I'm asking. I know and agree that content is king. But would/should changes to any of the above affect individual page (and site) ranking? Thanks!

submitted by /u/jvzammit
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