Let's say you have years of social-media experience and have maintained a blog that has shared needed advice. You can put together your top blog posts and put together an e-book, such as The Ultimate Social-Media Guide for Small-Business Owners, and sell it on your website or Amazon. If you don't have any experience that you want to cash in on but have a knack for writing, say, sci-fi stories, then you can author and publish your novel on Amazon as well.

Another flexible side gig that doesn't require long-term commitments is becoming a freelancer. This could be anything from writing content or designing a logo to filming a product ad or becoming a virtual assistant, it just depends on your interests and talents. Best of all? There's no shortage of websites and job boards to land one of the thousands of freelancing gigs available.
Teaching music requires skill, but you can make money on the side just by being able to sign things -- if you become a notary public. The rules vary by state, but you can expect to pay between $100 to $500 to become a notary public and start advertising your services. The National Notary Association reported in 2017 that half of part-time notaries were averaging up to $250 per month (that's $3,000 per year), with the other half earning more.
As for other tips, all I can say is “a penny saved is a penny earned”. If you are running out of ideas to make money, start saving. Some quick “low hanging fruit” tips to save some quick cash include – switch to MetroPCS or Boost for cellphone (I only pay $20/month), switch auto insurance to Insurance Panda ($25/month), and start using GasBuddy (saves me like $100/month at least. I drive a lot).

Considering that you have a finite amount of time, passive income should make up a large part of your work. If you're serious about generating any semblance of income online, then passive income should be one of your sole goals and ambitions. Why? Wouldn't you prefer to do the work one time and get paid repeatedly as opposed to relying on your time to generate that income? Invest the time at the front-end so that you can reap the benefits on the back-end. This means putting in a bit of sweat equity and not getting paid today. Rather, you'll get paid somewhere down the road. And you'll continue getting paid whether you keep building that passive income stream or you stop. 
My next self-funded business hit $160,000 in revenue in its first year alone. After that first taste of self-made success, I’ve gone on to sign consulting contracts worth tens of thousands of dollars with startups like LinkedIn and Google, launch profitable online courses, and grow my blog to over 400,000 monthly readers and $50,000/mo in side income.
Teaching music requires skill, but you can make money on the side just by being able to sign things -- if you become a notary public. The rules vary by state, but you can expect to pay between $100 to $500 to become a notary public and start advertising your services. The National Notary Association reported in 2017 that half of part-time notaries were averaging up to $250 per month (that's $3,000 per year), with the other half earning more.

Ebates: This app offers a simple way to make money online by buying whatever you're already buying and then getting a cash-back reward. With eBates, there is no scanning receipts. Simply click a link in the app and buy it from the store. You'll automatically be credited with your cash rewards upon purchase along with receiving an email confirmation.  
Webinars are quite possibly one of the most potent ways you can make an exorbitant amount of money online. You'll need an audience to train and you'll need to know what you're talking about. Of course, this usually requires having a website and some semblance of an online presence. However, people can still do webinars without all of that. For example, you might have a sizable social media following and you train them every week on something to do with social media. But you will need a product to embed and sell at some point. Don't worry about it in the beginning. In my experience, the best webinar platform out there is GoToWebinar. 
If you can offer a place for someone to park their car, such as in your driveway, you can make some easy money -- as long as it's conveniently located. (You'll also want to make sure that it's legal to rent out parking spaces where you live.) Look into sites such as Pavemint.com and parkeasier.com. You could have customers who pay you a few hundred dollars per month if you're near their workplace or home, or you might charge $10 to $20 or more for a few hours of parking, if you're near a stadium or other place where lots of people need to park.
If you have a vehicle that just sits in your garage for long stretches of time, you might find a car rental service like Turo is one of the easiest ways to make extra money. Let’s say you list your 2014 Nissan Maxima in Denver, Colorado. If you rent out your car for just 10 days a month, Turo says you could make around $365. That’s more than $4,300 a year!6
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