Buy underpriced used books. Outfit a phone with an ISBN reading app, scan the ISBN numbers of books at used bookstores and thrift shops, and compare the asking prices with what the books are selling for on a site like Amazon. Whenever you get a good hit (which won’t be often but, since the process is fast, won’t take long, either), buy the book and resell it online. Be discreet about this, as the store managers probably won’t like what you’re doing.
People are always looking to have their cars washed and detailed. You could be a mobile car washer and detailer with a permanent location. Reach out to people you know or make some flyers and put it in your neighbors' mailboxes. If you want to get serious about it, prop up a one-page website or give out business cards. You can make money quickly doing this.
Proz.com is a site where you can get paid to translate all kinds of documents, including files and even conversations. The site provides you with an opportunity to list your services as a translator. They offer opportunities in Spanish, German, Italian, Chinese, Arabic, Japanese and other languages, and specialize in legal, medical, technical and other fields.
My 10-year-old son brought home a book from our park’s free library box. It was a biology textbook – teachers edition. He said it looked interesting and hey, it was free (having no idea you could sell it). I scanned it in my Amazon seller app and realized it was worth around $150. He was so excited. We listed it for sale for $130 and it sold! Going to tell him, he just made $130!
In case of the latter, you will have to spend money on domain name and server hosting space that can cost you between Rs 3,000-Rs 5,000 a year. Self-hosted blogs have an added advantage that it allows you to customise elements and functionality of your website. In case of the former, you need to make peace with the tools and plug-ins made available by the service provider.
The ego is the driver making the decisions. It decides between the devil (the id) and the angel (the super-ego) on either shoulder (yes, all those cartoons you've ever seen are partly true). We have voices in our mind, and it's up to the ego to decide which one to fulfill. Its goal is to satisfy the id in some way while also attending to the super-ego.
If you are a budding photographer and would like to be paid for your craft then you should consider setting up your own photography website. This is a great way to not only promote your services as a photographer, but also to sell your images. You can charge visitors a fee to download your images. Or, if you’d rather, turn your site into a paid membership site, with free downloads of all images for paying subscribers.
Opening your shop, listing products and prices takes less than 30 minutes. It costs $0.20 to list one item in your shop for 4 month (or till it sales) and Etsy takes 3.5% commission from each sale you make. Mind that fact when setting up the prices. Shipping costs are either to be covered by you or by the buyer (you can set the rates depending on the buyer’s’ location e.g. free shipping around US; $10.99 shipping to Europe).
Redefine wealth. In studies of millionaires, people are surprised to learn that most millionaires aren't doctors, lawyers, and corporate leaders with big houses and fancy cars; they're people who religiously live below their means and invest the surplus into assets, rather than liabilities. As you're taking the above steps to make more money, keep in mind that increased income does not necessarily equal increased wealth. Most people who flaunt their wealth actually have a low net worth because their debt to asset ratio is high--in other words, they owe a whole lot more money than they actually have. All of the previous steps have outlined aggressive strategies for making money, but you'll never get anywhere if you have a hole in your pocket.
In 60 seconds, list your items for sale on Tradesy.com. They accept any brands, as long as it’s in good condition. Take a few photos of your items (plus, petite, and maternity sizes also accepted) and they will clean the background of the photo for you. Feel free to pick your own price or they will suggest one for you. When your item sells they will send you a free prepaid shipping kit, complete with packaging. Tradesy only takes a 9% commission and you get paid via PayPal. Unlike others, they take returns.
If you are more confident in your skills, you can also market directly to websites and blogs. You can contact the sites by email to market your services. That will also enable you to select the specific types of sites that you are more comfortable working with. Since there are literally thousands of websites and blogs on the web, the potential market is limitless.
If you are a confident web developer then designing your own themes is an obvious path to follow if you are looking to make money online. ThemeForest sells a wide assortment of developers themes, including themes for WordPress, Shopify, Weebly, and Tumblr, to name a few. Once you have created your theme, get it accepted onto the ThemeForest marketplace and make money each time it sells.
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. 
There are several websites offering money to undergo online surveys, carry out online searches, and write reviews on products. To get the credit, one needs to disclose certain information to them including one's banking details. This is why you should use this route with utmost care. Some of them may even ask you to register with them before working on projects. The most important watch out in such projects is to stay away from websites offering money that appears too good to be true. Be careful while evaluating the reputation of the website as many of them could be a scam. Most sites promote businesses showing copies of cheque payments which may have been given to the middlemen only.
Earnest (refinance your student loans): Same idea as above but on your student loans. There is $1.4 trillion in student loan debt outstanding. When you have student loan debt, it can make it hard to get ahead, invest, or to buy a home. If this sounds familiar, refinancing the debt can not only help you pay it off more quickly, but it can save you money on interest too.
Set up a roadside stand. Depending on where you live, you could profit handsomely by setting up a roadside stand. If you live near a resort area, for example, you could buy cases of bottled water, put them on ice, and sell them to passers by for twice what you paid. Selling fruit and produce you grow yourself is also a smart idea in highly-traveled areas.
A fitness site can have numerous revenue streams. Create healthy eating plans and recipes and lock them away as premium content. Promote and sell a fitness training course, eBook, or a series of videos. Or advertise your own personal fitness services on your site. Topfithub is a good example of a fitness site with decent video content alongside product reviews.
Please note that some of the links below are affiliate links and at no additional cost to you, I will earn a commission. Know that I only recommend products, tools and learning resources I've personally used and believe are genuinely helpful, not because of the small commissions I make if you decide to purchase them. Most of all, I would never advocate for buying something that you can't afford or that you're not yet ready to implement.