Affiliate marketing has increased in prominence with the internet age. Amazon popularized the practice by creating an affiliate marketing program where websites and bloggers put links to the Amazon page for a product being reviewed or discussed in order to receive advertising fees when a purchase is made. In this sense, affiliate marketing is essentially a pay for performance marketing program where the act of selling a consumer on a product is outsourced across a potentially vast network. 

Amazon makes it fairly easy to list and sell old books, games and devices on its marketplace. You can make more than just a few bucks If you have pricey textbooks from college. Be sure the books are in good condition. You'll get negative reviews if you attempt to sell books that are falling apart or games that are scratched up. Remember, be upfront about any defects, no matter how small they might be and no matter how few people might readily notice it. 
The concept of affiliate marketing on the Internet was conceived of, put into practice and patented by William J. Tobin, the founder of PC Flowers & Gifts. Launched on the Prodigy Network in 1989, PC Flowers & Gifts remained on the service until 1996. By 1993, PC Flowers & Gifts generated sales in excess of $6 million per year on the Prodigy service. In 1998, PC Flowers and Gifts developed the business model of paying a commission on sales to the Prodigy Network.[8][9]
These ways of making extra money cover a wide range in terms of compensation and prestige. Check out the options to see what could work for you, keeping tabs on a projected per-hour rate so you can see what would be worth your time. The list is loosely arranged by 1. jobs requiring more skill or expertise, 2. gigs needing less and 3. things you can sell. And if you think of any good options I missed, please let me know in the comments.
You are seeing positive stuff online, because Wealthy Affiliate is the industry leader and has been for some time. There are over 50,000 positive reviews online last time I checked, by independent bloggers and authorities within the affiliate marketing world. There is a reason that they have been in business since 2005 and continue to grow, and evolve their business for their customers. A truly caring company.
There is also Facebook, Instagram, Pinterest, LinkedIn, and Twitter training for those that want to get social reach. There is paid traffic training, using PPC channels like Facebook Ads, BingAds, and Google Ads. And you can even get help creating and operating VIRAL campaigns which can happen if you create your content in a specific way. This can be a powerful approach as well.

File-Sharing: Web sites that host directories of music, movies, games and other software. Users upload content to file-hosting sites and then post descriptions of the material and their download links on directory sites. Uploaders are paid by the file-hosting sites based on the number of times their files are downloaded. The file-hosting sites sell premium download access to the files to the general public. The websites that host the directory services sell advertising and do not host the files themselves.
It’s free to join the SellHealth affiliate program, though you do have to apply and be accepted before you can start promoting their products.  Once you’re accepted, you’ll have access to a number of tools, graphics, banners and more that you can use to promote SellHealth products.  The sales are actually made at company-owned Websites, which look professional and handle all of the selling. Commissions vary, but the base rate is 30% of all sales and upsells, and SellHealth says you can earn up to $350 per sale.
Host a yard sale to get rid of things you don’t want anymore. Clean out your room and gather up all of the toys, decor, and clothes that you no longer use or want. Display your items on a folding table in your yard or driveway with your parents' permission. Put prices on each piece with a sticker label based on what you think it’s worth and the original price of the item.[4]
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