My 10-year-old son brought home a book from our park’s free library box. It was a biology textbook – teachers edition. He said it looked interesting and hey, it was free (having no idea you could sell it). I scanned it in my Amazon seller app and realized it was worth around $150. He was so excited. We listed it for sale for $130 and it sold! Going to tell him, he just made $130!
6. Rent out your room on Airbnb. Airbnb.com is an online marketplace where people buy and sell the space they own. Some people rent out their vacation homes, some rent out their floor and an air mattress, and some rent out the treehouse in their backyard. (Seriously.) If you have space in a popular area, then you can easily create your own hotel of sorts.
This business is similar to the computer repair business, but you will take on all sorts of electronic equipment besides just computers. With smaller electronics, you will need to be prepared to have customers bring their repair projects to you, as you would have difficulty recovering the cost of driving around picking up broken equipment and returning it. You may also want to encourage people to give you their old electronics so you can use them for parts.
As far as network marketing is concerned, I think it’s very difficult for an average person to get through what it takes to make money. Being told that they have to try to recruit their warm market, have home meetings, prospect strangers and attend hotel meeting every week. I believe these task are so painful and takes the average person too far out of their comfort zone, it feels like a relief to just quit. I personally believe in network marketing and there are some awesome companies and awesome products. But it seems like people have to go through a lot of pain and sacrifice before they can win in traditional network marketing.
While cryptocurrency is still relatively new, it will ultimately become the standard. Bitcoin and Etherium might be the primary cryptocurrency platforms today, but the US Dollar will eventually become the Digital Dollar by leveraging the blockchain. You can take advantage of the current boom in cryptocurrency by trading it through platforms like eToro and Kraken, amongst many others. 
I look for deals that have multiple other products they sell, so that if this products slows down, they can use the revenues of other products to pay back. I also look at deals that have multiple offers they’ve paid back on Kickfurther, and also for companies that have robust retail distribution partnerships in place (like they are at Target, Walmart, etc) rather than companies that are more seasonal and rely on trade shows and such, which is unpredictable and expensive.
Finally, when looking around for the right personal finance software that meets your needs, make sure that you’re comfortable with the program’s interface. It shouldn’t be expected that you recognize every single feature instantly, but if the features don’t seem readable and manageable to you, then you’re not as likely to use it and get the full benefits.
"Work from Home" is a midtempo song with elements of trap music. Katherine St. Asaph of Pitchfork noted elements of Rnbass in its production,[21] while Meaghan Garvey from MTV found tropical house influences on its beats.[22] Discussing the song musically, Chris Martins from Billboard classified it as a "a pop-R&B confection that siphons off the a tropically tinted EDM pool."[18] According to the sheet music published by Sony/ATV Music Publishing, "Work from Home" is written in the time signature of common time, with a moderate tempo of 104–108 beats per minute. It is composed in the key of A♭ major as quintet's voices span the tonal nodes of G3 to F5. "Work from Home" follows a chord progression of Fm–D♭—A♭.[23]
Teach. If you're an expert in a certain subject, see if the community, local colleges, or even the private high schools in your area are looking for a teacher in your field. If you can pick up just one night class per week, it can make a difference in your income. Though you'll need certification to be a traditional teacher most of the time, to teach part-time you may only need a master's degree and proof of your expertise.
Offer to watch children or pets. If you know anyone who has children or pets, you could easily begin a side gig as a babysitter or pet sitter. To let people know you’re interested, send out a group email describing your services, post an ad on Facebook, or tell friends and acquaintances about your availability in person or over the phone. You can also create a profile on a babysitting referral site like Care.com.
Driving for one of the two globally expanding app-centric taxi alternative services, Uber or Lyft can still be a fairly lucrative way to earn money as a side business idea on nights and weekends—working only when you want. But before you dive head first into this side business idea, do your homework and calculate the costs of extra gas, mileage, tires, wear & tear and usage on your vehicle—it's not a guaranteed business idea that'll turn a huge profit every weekend.

I know starting a blog is a way to make extra money.  I just wish it was not take so much time it is not easy. To come up with new things to write about plus getting the traffic to your site. Just like your list here no way you just set down and wrote this all at once it took a lot of research and searching your brain.  Great info and thanks for taking the time to put it all together.
The hardest part in making extra money is always the FIRST STEP in how you can earn extra cash. These tips will serve as a spark for those who are really confused where and when they should start with this financial journey. Making money is not all about intelligence, it is all about making your intellect work for you to have money. It is the wit-the “street-smart” style of approaching things.
This has become a popular business model for online entrepreneurs over the past several years, and will probably just continue to grow in popularity. The best thing about selling online courses is that once you do the up-front work in creating the course and setting up your marketing strategy, you can get paid over and over again for work you do once.
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