I am going to give you my massive list to create backlink but be sure to remove footprint from every backlink and diversify your anchor text with different version of keywords.
1. Web 2.0
2. Directory submission
3. Q/A sites
4. Forum
5. Social Bookmark
6. Link wheel
7. Blog comment
8. GB(guest...
I am describing some point here:
1. Find a market to choose a product
2. Than choose a product which has demand and low competition and unique niche
3. Than join there affiliate program and build a site with their affiliate link and gain some visitor to buy from you.
4. If they buy the product...
301 and 302 is the classification of Redirection where 301 redirects means redirect one URL to another permanently where link juice passes 93% almost. and side by side 302 redirects means redirect one URL to another URL temporarily where link juice never pass.
By which you can command every search engine whether your site will be crawl or not and what will be the access permission in your site. Robots.txt is more important for a site.
Good question. I am going to try to give some advise. First Go Ahrefs.com than look for Referring domain you have and download this in excel sheet than sort out every link by good to bad priority than remove it one by one. Hope it helps.