I am new to SEO, and after searching and reading articles and tutorials about SEO. I found that recently, after the Google Penguin algorithm was updated, many websites dropped because of the low quality backlinks on their websites. As a solution, I read that categorizing backlinks into Low quality and High quality is a good way to filter them. In order to know the quality of the website, we have to check it's Page rank (PR).
Based on this solution, I recently checked an example of a site having many backlinks. So I've downloaded these backlinks. For example:
To filter the list, I want to check for the quality of its links, which is the Page rank.
My questions are:
1 - Should I check the page rank of the main page of the domain:
Or I should check each page for it's Page rank:
2 - Is page rank the only measure for link quality ?