I was wondering, what is considered the best statistic information from Google Analytics for website optimalisation?

Example 1: Alot of visitors leave the website on a specific page, this could be because there aren't enough forwards / links on that page so that the visitors don't see a reason to continue their travel on the website.

Example 2: Your traffic sources are 70% direct visits, 28% redirects from other websites and 2% by search engine. You could say that your website is not easily findable in search engines which could be interpreted as a sign that your keywords and/or meta description aren't good enough to be found.

I'd like to hear some from other people!