The implementation of affiliate marketing on the internet relies heavily on various techniques built into the design of many web-pages and websites, and the use of calls to external domains to track user actions (click tracking, Ad Sense) and to serve up content (advertising) to the user. Most of this activity adds time[citation needed] and is generally a nuisance to the casual web-surfer and is seen as visual clutter.[citation needed] Various countermeasures have evolved over time to prevent or eliminate the appearance of advertising when a web-page is rendered. Third party programs (Ad-Aware, Adblock Plus, Spybot, pop-up blockers, etc.) and particularly, the use of a comprehensive HOSTS file can effectively eliminate the visual clutter and the extra time and bandwidth needed to render many web pages. The use of specific entries in the HOSTS file to block these well-known and persistent marketing and click-tracking domains can also aid in reducing a system's exposure to malware by preventing the content of infected advertising or tracking servers to reach a user's web-browser.[citation needed]
My third question is: Finally when i have decided the keyword, the next step is to search on Amazon about the baby shower gifts- it shows thousands of searches. Then how am i to decide which product should i choose- if i were writing a post on say ‘cute baby shower gifts’? Should i look at the price of each product which i am going to add in this post? How to decide?

This is the easiest way to gain experience because you get exposed to other affiliates. You can meet people by joining a discussion forum or an online community. The good thing is that they are free to join and you get very good advice there. Examples of such online communities are ABestWeb, Digital Point, and Warrior Forum. Apart from getting advice from more experienced affiliates, you get the chance to network with other marketers.
Affiliate marketing is commonly confused with referral marketing, as both forms of marketing use third parties to drive sales to the retailer. The two forms of marketing are differentiated, however, in how they drive sales, where affiliate marketing relies purely on financial motivations, while referral marketing relies more on trust and personal relationships.[citation needed]