Write and publish an eBook. You don’t need a traditional publisher and financial backing to publish your own book anymore. In fact, Amazon.com makes it possible for you to publish your own eBook and sell it independently – with no financial investment on your part. And with Kindle eBook publishing, your book will appear on Kindle stores worldwide within 24-48 hours. Just be prepared to market it yourself on social media, your blog, or elsewhere if you expect to generate sales.

And while you’ve probably heard of selling sperm or eggs, don’t get your hopes up: Yes, the young and the healthy can sometimes earn good money as sperm or egg donors, but such opportunities require extensive screenings and long-term commitments. Donating blood (sans plasma), meanwhile, is a great and altruistic thing to do, but you generally won’t get money for it.
Real estate is sometimes a good investment, but it is expensive. Investing in the stock market does not have to be expensive, but it can be risky and unstable. A 401K is a wise investment that you should invest in, but it can depend on how well the business you work for is doing. There are plenty of factors to consider when investing, so make sure you think about it rationally. Talk to experts or friends who are experienced in investing before making a decision.
If you’re trained in a marketable skill — like graphic or web design, SEO writing, or video animation — to the point where you can bang out the work in your sleep, you can make a pretty quick buck with it on Fiverr. Whether it’s the best long-term strategy for your freelance career is debatable – and it’s one of the least lucrative gig economy side hustles out there – but that’s not the point; the point is that there’s the potential for earning money quickly.
Double check yourself, before you double wreck yourself. Make sure everything you send to a company, whether a résumé, an email or a portfolio, is good to go. Double check your grammar and wording, and for God’s sake use spell check! This is especially important when it comes to the company’s name. Don’t spell their name wrong and be sure to type it how they type it (e.g. Problogger, not Pro Blogger).

Do you enjoy fast food or going into retail shops? Many companies hire mystery shoppers to test the customer service of their stores. A common one is Subway, which hires mystery shoppers to ensure that "Sandwich Artists" are following all the franchise guidelines. If you have time and can travel to different places, this could be a good side hustle.
Sites like Cookening, EatWith, and MealSharing are to restaurants what Airbnb is to hotels. Sign up as a host to earn dough by cooking and serving meals to guests in your home. It's up to you what you want to cook and how many people you can accommodate. Cooks are paid directly through the site, so no cash ever changes hands. The earning potential for becoming a cooking host is $50-$100 per meal.
Sell sperm if you are male and meet the eligibility requirements. If you are male and meet certain criteria for height, age, and education, then you may be eligible to make money as a sperm donor. Donors make around $70 (USD) per donation or up to $1,500 per month at some sperm banks. However, only a small percentage of applicants are accepted. If you want to try to make money this way, look for a sperm bank in your area, check their eligibility requirements, and complete an application.[24]
If you want to be a millionaire, it helps to know what you want, and then have the discipline to go after it. When you set a goal, you focus on it and pursue it. This means that you don’t get sidetracked by less important matters. If you know that you need to set $1,000 a month aside in order to meet your millionaire goal within an allotted timeframe, you focus on that. You cut expenses or, better yet, look for ways to increase your income, so that you can meet your goal. Sometimes it’s not fun, but millionaires usually stick with it.
The last step resides in the concept of contribution. Even if you have no money, find a way to contribute to others. Look for opportunities where you can help those around you. Whether they're in need or not, this mindset will drive home the point that you have more than you need, even if you physically don't. Search for ways, every single day, where you can contribute either your time or your money to those who might be less fortunate, because that's the true essence of success in every form.

Go hunting or foraging for food. You may need to invest in gear and permits, but if you already have these, this is an inexpensive way to get your own food. If you're ethically against the killing of animals, it's pretty easy to forage for food, depending on where you live. Just make sure to forage only for food whose origin and properties you are sure of. Getting sick or poisoned is never any fun.

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