Make the most of your spare space by listing it for short term rentals with Airbnb. If you know how to be an Airbnb host that wows their guests, you have an amazing opportunity to make money fast. By creating a wonderful experience for your guests, you’re setting yourself up for great reviews and lots of repeat guests. Check out our complete guide on getting started as an Airbnb host.
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.
I don’t frequent these forums too often (and there’s often a lot of garbage to sift through), but there are some gems of information here. It’s usually a good place to check on reviews of various SEO software, see what people think about different changes in the MMO world (like when Google changes their ranking algorithm), and other miscellaneous MMO/affiliate marketing topics.
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. 
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online.
With any business, there are ways you can get started putting a lot of money down upfront. There are also ways to start an online business that don’t cost much. With the affiliate marketing business model, the startup costs are low, but you will be relying on organic traffic. Some affiliate marketers rely too heavily on paid traffic, which will quickly eat into your profits. Put work into your search engine optimization (SEO). It will pay off in the long run.
Completing paid surveys is one of the most popular ways to earn extra cash online. There are entire websites devoted to nothing but surveys that you can register with and be paired with surveys that best fit your profile. You will get paid according to the terms listed at the beginning of the survey and will have the chance to add some extra money to your wallet. When taking surveys, it is important to be honest and take them seriously because you can be banned from the site the researchers determined you did not put any effort into your answers.