Sign up with focus groups in your area. Studies that you are eligible to participate in pop up sporadically but pay quite well – often more than $50 for an hour of your time. You can also look for focus groups online but will have to sort through a lot of bogus “opportunities” and sites that ask you to pay up-front for the privilege of participating before you find anything worthwhile.
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Clearly, there's a lot of demand on Amazon, and if any product is going to sell, it's going to sell well on Amazon. But the goal here is to source the right products that will easily sell at the world's largest online retailer. Generally, products between $10 and $50 sell very well here. Just be sure to do the right market research before jumping on this bandwagon.
Writing an eBook and selling it on your blog can be a great money maker. Your eBook should be directly relevant to your blog’s content so you can sell your book to your existing audience. Creating a recipe eBook for a food blog or an eBook full of training plans to complement your fitness site are just a couple of examples that have the potential to sell.

Getting businesses to advertise on your podcast, either at the beginning or end, or both, is a great way to create a revenue through podcasts. Most businesses won’t be keen to advertise on your podcast until you can prove a large number of listeners. Therefore, it is unlikely you will be able to start out from the get-go with sponsors. But once you accumulate regular listeners, or a high number of downloads from iTunes, you can start to sell advertising space on your podcasts.
Your first comment is very incriminating. It is obvious that by making the distinction that your are not a journalist or authority, that you claim no responsibility to give accurate figures when you cite concrete data. I’m sure your readers will like to know this. On the top 10 MBA salaries, I actually thought that those numbers sounded reasonable, even conservative. The policeman salaries, or the oracle software sales rep salaries were very different than I found. I think the law partner salary is inflated as well. From what I could find their incomes had such a high variance that average is likely>>median, which is a more meaningful figure in this instance.
For instance, they offer 50 cents if you upload a picture of a receipt where you bought milk and offer $10 for a picture of a Best Buy receipt. Of course, it makes no sense going out and purposefully buying products with the highest rebate, yet it won’t take much of your time taking and uploading pictures of things you typically buy and stash some extra cash by the end of the month.

If you have a good idea for an app, and the skills to create it, then producing your own premium app can be profitable. However, with so many free apps available, it may be hard to convince people to pay. If you want to go down the premium app route, consider having a basic free version to encourage people to download the app in the first place. You can then provide the option of upgrading to a premium plan once users realize how useful the app is.
The first follows the startup path we outlined above: You have a disruptive idea for an app or piece of software, you validate the idea with real customers, and then raise money to hire developers or a development studio to build, launch, and scale your software. If you’ve done everything right, your software will be accepted to the Apple and Google Stores and you’ll make money every time someone downloads it or pays for a premium feature.
You could also opt to use existing websites for making money. These include both active income and passive income methods. For example, you could sell some used items or invest in creating some digital designs that then can be sold on merchandise. Again, devote a sizable portion of your time to passive income so that you can slowly build up earnings that will arrive on autopilot without any extra added effort. 
Last but not least, you can also earn money online by building an online community, although the monetization strategies you can pursue will vary a lot depending on your goals. You can build a community with a blog, for example. You can also build an online forum and charge people for membership. You could even build up a Facebook group and use your influence there to sell and promote products.