Hi! I understand that in order to increase PR we need to build backlinks for our site. But my question is how many backlinks required to have PR1, PR2 and so on if I only placed backlinks from PR0 site?
Prefer to work more on On Page Factors. That should get you a few PR votes from within the site itself. And gradually try to work out ideas for generating new links to your site. Hope this helps.
If you have a new site with PR0 then you start work on page optimization of your website because after analyzing your site by Google give you PR1-PR2 or more according to your page optimization and content."
Actually the number of backlink we need to increase your PR is not limited by any thing. Bu I can say it would be better if you maintain quality backlinks. Huge amount of unrelated backlinks will be of no use. Keep related backlinks as much as possible. It would be great if you choose links which contain keywords.