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Affiliate programs are the most effective way to promote the service and products.

Cross linking is a traditional method of linking websites. Like for e.g. Page X and Page y.
•   Page X  to page Y
•   Page y to page x
•   Page X to home page.
•   Page y to home page.

I would like to share my views on this topic:-
Nofollow tells search engines not to crawl links or ignore it, but on the other side, it helps search engine to identify which web page is ethical or genuine. A person who is familiar with SEO knows nofollow or dofollow links, but ordinary person just click on the link if he/she feels that result is worthy or interesting and this helps us to get traffic. Below mentioned points should be considered by everyone:-
1) Help to increase graph of sales.     
2) Generate other links.
3) Keeps portfolio natural.
4) It informs search engine that you played safely and are following rules.

While choosing name try to avoid using "numbers and hyphens" because many times people who hear your website address don't know, if you are using a numeral (5) or it's spelled out five or they misplace or forgot the dash.