This article describes how to get the CurrentPage of Umbraco in a partial view.
When you want to get metrics related to user interactions on various parts of your website Google Analytics (ga) event tracking can be helpful and is easy to integrate as well.
Adding rewrite rule in release config is handy so that it will not affect during Debug mode.
When considering SEO, either you have to stick with www versioned url or non-www URLs. Having both accessible for a domain is a bad practice.