Using Fiverr is a great way to pick up work. Once you have signed up you can advertise your services. Fiver allows you to create your own gigs, whether you are offering web design, digital marketing, writing, or something else. You can choose how much you want to charge (it can be more than a fiver) and people will then contact you if they are interested in working with you. Fiverr will not only help you get experience if you are just starting off as a freelancer, it will also help you earn some extra cash.
How many email newsletters are you bombarded with every single day? There’s a reason for that. Marketing to an actively interested group of email subscribers is one of the best ways to make money online. There have even been million-dollar businesses built from simple email newsletters like TheSkimm, or Mister Spoils. Each newsletter targets a specific type of user with interesting, daily content, while also partnering with relevant companies and affiliates to bring in extra money. If this seems daunting, it’s not. Tools like MailChimp, ConvertKit and AWeber make it easier than ever to get started with email marketing. And another great option to consider (with the largest free plan available) is SendPulse, with their ability to send up to 15,000 emails per month to 2,500 subscribers, and then affordable plans starting at under $10/month as you grow from there.
If you have nice items like cameras and other A/V items, musical instruments, drones, and even toys and other children's items, you can list it online for rent. One of the best places to do this is a funky site called Fat Llama. People are reporting to have made over $1,000 renting out equipment on this platform. Plus, if you sign up using this link, Fat Llama will give you a $20 credit! Get $20 credit with Fat Llama.
Do you know there are companies and people out there that make some pretty good money offering their cleaning services to households and companies? They'll come in and charge you either a set fee per room or an hourly fee to clean up. They can come weekly, monthly, or whenever you think you need some extra scrubbing. What's the point? Why not have the person they hire be you?
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
If you are a professional photographer, or have a real flair for photography, then selling your images on other sites could be an idea. This could be done alongside your own photography site, as it is a good way help get your work viewed by a wider audience. There are numerous stock image websites to contribute to, but choosing a popular high-end site like Shutterstock should ensure your photographs make you some money.
Fiverr. This is a popular website that can be helpful for freelancers with actual skills. Know something about digital animation? You can work for someone who doesn't and pick up some extra cash. But if you just have a brain but few skills, you can offer to do web research for someone, and maybe someone will hire you. Just know that you probably aren't going to get rich doing these jobs. The website's tag line is, "Freelance services for the lean entrepreneur," which tells you right away the pay is – meh. Plus, the website's name comes from the fact that many people work for $5 per task (but, yes, you can ask for more). Still, if you get a lot of gigs, it can add up.
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Swap.com. Like ThredUp, it's an online consignment store. You send in used clothes (women, kids, men's) and kids toys and games, and Swap will sell them for you. Hopefully. They may reject them, in which case you'll either have to pay a fee to get your things back or donate them. But assuming you're sending in clothes and toys that people will want to buy, your odds of selling them should be good. The website says that "sellers, on average, earn about $150 per box they sell on Swap.com when sending in-season, high-quality items." Especially note the words, "high-quality."
Now, this isn't about some get-rich-quick method here. If you want to get rich quick, forget about trying to do it on the internet. Sure, Facebook ads are all the craze, but without a serious understanding of the mechanics behind sales funnels and conversion optimizations, which only comes after years and years of in-the-trenches work in the internet marketing field, you're largely wasting your time trying to "get rich quick."
Sell stuff online. If you have high-quality items to sell, there are a slew of online marketplaces you can use. Just make sure you understand the fees associated with your sale before you take the plunge. Where neighborhood Facebook pages and Craigslist ads are free, many online marketplaces or consignment shops charge for ads or require you to fork over a percentage when you make a sale.
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.