However, one day I had a reader offer to write a book review for me. I knew the reader so I was confident the review would be OK to publish. As with all my reviews, it had an affiliate link to Amazon in it. I was a little skeptical about whether the review would convert. I thought my readers might not respond as well to a stranger’s review of the book. I was wrong. 

Feed and take care of your neighbors’ pets while they’re out of town. Pet sitting is just like babysitting but for animals. If you’re comfortable with animals, let your neighbors know that you’re available to watch their pets when they go away. Always respect their rules and ask ahead of time if you have any questions about the care instructions.[13]
Great advice here. The typical idea of writing reviews of bicycle pedals and expecting someone to follow your link in order to buy a pair is dead. Now if you are actually a cyclists, and you know something about all the different types of pedals, and why different types solve different cycling problems, then hey, welcome to the world of providing useful content.
You could try advertising more, for example, by putting up signs around the neighborhood, posting about it on social media, or having people you know spread the word. You could also try doing it in a different neighborhood that might have friendlier people, or do it in a time and place where there's likely to be a lot of people walking around the area (e.g., near a church before the end of a mass). 

My tip: Have one main credit card. Have a second one that you use for necessities – such as groceries or gas – that offers rewards for those purchases (a lot of cards do) and set the second one on auto-pay. You should be able to pay off a smaller amount on auto-pay if it is a necessity. If you think you cannot, then you may need to cut down a lot on expenses.
If you're serious about making money online, start a blog. Blogging is one of the easiest and most sustainable income sources. As long as the blog is setup the right way, in the right niche, with the right content targeted at the right audience, and the offer is complementary to the content, you could make a tremendous amount of passive income from a blog.
You can sell your ebooks through Amazon's Kindle program or Apple's iTunes Connect, which gives you access to a large majority of the digital-book reading market and the barriers for entry are incredibly low. You don't need to invest lots of money to make this happen, but you do need to invest lots of time, not only in writing the ebooks, but in marketing them as well.
Research other listings in your city on AirBnB and see what the going rate is for a place like yours. You could also just rent out a private room as well or even a bed in a shared room. In fact, that's how AirBnB got its start. However, you might find it hard in the beginning without reviews, but as long as you take really good care of your guests and provide a lot of value, the reviews will eventually come rolling in.
18. CraigsList – Some things don’t ship very well. Other things may make you feel uncomfortable to sell to someone across the country. Anytime you’re selling a large item or something you just don’t want to ship, Craigslist is a great place to go. It’s simple to list your item (again, take good pictures!). If you don’t like the idea of putting your phone number out there, the interested individual can send you a message to your inbox without even getting your email address.
Yesterday I earned $506.03 from Amazon. It was actually a pretty good day, higher than average. One might think the higher than normal figure came from selling some big ticket items but that wasn’t the case. The highest commission for the day was a $21.34 commission. The vast majority of the sales were books sold from my list of photography books, which we promoted on social media recently.
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