All of these are great ideas to earn a little more spending (or saving) money! I agree that investing in real estate can be passive, but it also depends where you invest in! If you invest in real estate in a college town (which has many pros and can give you a nice deal of money), in my opinion it doesn’t tend to be passive! College students (even the more responsible ones) tend to cause wear and tear, making your job as a landlord non-passive.
Next, you’ll need the right tools. You can be as complicated or simple as you want depending on your comfort with audio equipment, but at the minimum you’ll want a microphone and software for recording your voice. Companies like Behringer, Blue, Focusrite, and others sell studio-quality plug-and-play podcast setups that can get you recording today.
​Self Publishing is mainstream today. When you purchase an eBook off of Amazon there’s a pretty good chance you’re buying a self-published book. Self-publishing is also ridiculously easy. I tried this a few years ago and couldn’t believe how simple the process was. To self-publish a book you’ll first need to write and edit it, create a cover, and then upload to a program such as Amazon’s Kindle Direct Publishing. Don’t expect instant success though. There will need to be a lot of upfront marketing before you can turn this into a passive income stream.

Mechanical Turk is Amazon's take on micro-jobs. These are small miniscule-jobs that you can do for other people, which they call HITs, or Human Intelligence Tasks. These are super simple tasks that anyone can do. Some examples are listing off some URLs with certain kinds of images for one cent, or recording a few phrases with a microphone for 6 cents.
Do you love getting refunds? How cool would it be to get money back on stuff you’ve already bought? Paribus is a service that lets you find out if stores you’ve shopped at online owe you a refund.  It’s free to sign up. Paribus connects to your email account and checks your receipts.  If they find out a retailer has dropped their price they file a price adjustment claim for you.  Try out Paribus.
You'll also need ecommerce software, fulfillment software, worry about warehousing, customer service and refunds. But that's not all. You'll also need traffic. Think search engine optimization, Facebook ads, and other social media campaigns. It is hard work, especially on your own. You could opt for Amazon's platform, which might be the easier route. But, then again, at the end of the day, this is a serious business, which could produce significant profits. So you're either all in or you're not. 
Has anyone ever told you you have a voice for radio? Are you great at creating original characters with just your voice? There are tons of people looking to pay for quality voice overs for their corporate videos, animation series, or educational videos. Check out Fiverr and UpWork or create a profile on a specialized site like Voices.com or The Voice Realm to get started making money online doing voice overs.
When money is lent to a partnership or S-corporation acting as a pass-through entity (essentially a business that is designed to reduce the effects of double taxation) by that entity’s owner, the interest income on that loan to the portfolio income can qualify as passive income. According to the IRS's Passive Activity and At-Risk Rules: "Certain self-charged interest income or deductions may be treated as passive activity gross income or passive activity deductions if the loan proceeds are used in a passive activity."
Amazon Mechanical Turk is a service that lets you make money online through doing paid microtasks. Each task is something simple that requires human interaction like rating search results, checking for the right spelling on search terms, categorizing the tone of an article, or even basic translating. You can do these tasks from anywhere you want and make money online from the world’s largest e-retailer.
There are three main categories of income: active income, passive income and portfolio income. Passive income has been a relatively loosely used term in recent years. Colloquially, it’s been used to define money being earned regularly with little or no effort on the part of the person receiving it. Popular types of passive income include real estate, peer-to-peer (P2P) lending and dividend stocks. Proponents of earning passive income tend to be boosters of a work-from-home and be-your-own-boss professional lifestyle. The type of earnings people usually associate with this are gains on stocks, interest, retirement pay, lottery winnings, online work and capital gains. 
If you are struggling to find exactly the material you are looking for, try Open Culture’s listing of free online education courses. The page highlights 1000 lectures, videos and podcasts from universities around the world. The site features a lot of material found only on universities private sites, all in easy to browse categories. This means you can find hundreds of university courses, without having to visit and search each university’s own site.
As someone who's been immersed in a number of online industries for quite some time, I know a thing or two about what it takes to succeed in this arena. However, just like you, I started at ground zero with little knowledge, but a great deal of passion. What I learned along the way were some invaluable lessons from failure that hurt at the time, but helped immensely in the grand scheme of things.
I share this with to let you know how much your expertise and your creating this information means to me. I will now put this link to your site on the Inspire-EDNF (Ehlers Danlos National Foundation) site to help so many others like me. Living with this condition, I can become a hopeless mess. Today, THANKS to you, I can begin planning how to contribute not only to my family and savings but also to causes very close to my heart. https://www.youtube.com/watch?v=EAj0ZsYcHkQ
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