Always disclose your affiliate relationship. Most visitors will probably understand that graphic ad will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.

Stations which carry a network's programming by method of affiliation maintain a contractual agreement, which may allow the network to dictate certain requirements that a station must agree to as part of the contract (such as programming clearances, local programming quotas or reverse compensation of a share of a station's retransmission consent revenue to the network). Affiliation contracts normally last between three and five years, though contracts have run for as little as one year or as long as ten; in addition, if a company owns two or more stations affiliated with the same network, affiliation contracts may have end-of-term dates that are the same or differ among that company's affiliates, depending on when a particular station's affiliation agreement was either previously renewed or originally signed.[1]
The General Data Protection Regulation (GDPR), which took effect on May 25, 2018, is a set of regulations governing the use of personal data across the EU. This is forcing some affiliates to obtain user data through opt-in consent (updated privacy policies and cookie notices), even if they are not located in the European Union. This new regulation should also remind you to follow FTC guidelines and clearly disclose that you receive affiliate commissions from your recommendations. 
As search engines have become more prominent, some affiliate marketers have shifted from sending e-mail spam to creating automatically generated web pages that often contain product data feeds provided by merchants. The goal of such web pages is to manipulate the relevancy or prominence of resources indexed by a search engine, also known as spamdexing. Each page can be targeted to a different niche market through the use of specific keywords, with the result being a skewed form of search engine optimization.
Regarding “convincing someone to buy your product is not that easy”, I do agree with you, but at the same time, I remember all those products I’ve bought online. I did not search on Google for those products neither I went to the company websites to get information and buy. They were affiliate people and their blogs that inspired to buy them. PrettyLink Pro, SEO Pressor was recommended by Kimberley, I bought Profits Theme, WP Zon builder because Alex Whaley recommended. Similarly I bought CommentLuv Premium because Ileane, Kavita, Steve and many others were talking good about it.
Established in 1997, FOREX CLUB (the company) is the brand name for a group of companies that provides clients from over 120 countries with platforms and services for trading forex, CFDs and other online trading and educational products. We offer every client effective tools in training, analytics and education, as well as personal support where they want it. FOREX CLUB has over 650 employees worldwide.  In 2011 alone, over 45,000 traders chose to learn forex trading with us.  FOREX CLUB was one of the industry’s first to offer zero spread trading and commission refunds on all unprofitable trades.
The "member station" model had historically been used in Canada in the early days of privately owned networks CTV and TVA, but the original "one station, one vote" model has largely faltered as increasing numbers of stations are acquired by the same owners. In CTV's case, the systematic pattern of acquisition of CTV member stations by the owners of CFTO-TV in Toronto ultimately allowed control over the network as a whole, turning former member stations into CTV O&Os.[6]
I will give you a very simple example. Let’s say you build up an audience of 50,000 readers and out of that 50k you have about 1% that trust you (1% of people that trust you online is actually very huge), so that equates to 500 readers. Out of that 500 readers you will have about 10% that will buy your eBook and other affiliate products, so 50 people total. So, if you are selling your eBook for $10, you will make $500. Of course it doesn’t stop there, those people that buy the eBook and like it will most likely recommend it, and you will have a snowball effect where more people keep buying your book and other affiliate products. This is just a rough example that shows you some realistic numbers. Do not ever think that if you build up a huge number of readers that they will all trust you and buy the products that you promote; if it was that easy everyone would be a millionaire by now.
In November 1994, CDNow launched its BuyWeb program. CDNow had the idea that music-oriented websites could review or list albums on their pages that their visitors might be interested in purchasing. These websites could also offer a link that would take visitors directly to CDNow to purchase the albums. The idea for remote purchasing originally arose from conversations with music label Geffen Records in the fall of 1994. The management at Geffen wanted to sell its artists' CD's directly from its website but did not want to implement this capability itself. Geffen asked CDNow if it could design a program where CDNow would handle the order fulfillment. Geffen realized that CDNow could link directly from the artist on its website to Geffen's website, bypassing the CDNow home page and going directly to an artist's music page.[14]
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