Don't put all your trust in Social Security. While it's a good bet that Social Security will continue to work for the next 20 or so years, some data suggest that if Congress doesn't radically alter the system — either by raising taxes or reducing benefits — Social Security won't be available in its current form. It is probable, however, that Congress will act to "fix" Social Security. In any event, Social Security was never designed to be the only resource for retirees in their later years. That makes it all the more important that you save and invest for the future. 
If you’re a skilled worker in a specific niche, like marketing, design, or software development, there are specialty marketplaces that cater just to you. These are amazing places to make money online as you know that the people visiting them are looking specifically for the skills you have. Check out places like 99Designs or Dribbble for designers, Cloudpeeps for marketing and SEO professionals, and TopTal, Crew, or Gigster for high-level software developers. Once you've built up your development skills, you can begin building a brand for yourself as a higher-value consultant and start charging brands for larger projects like implementing an entire WordPress security overhaul or migrating a website from http to https.
Your next goal should be to invest in yourself; you are the best resource you have to accumulate wealth. Investing in yourself means spending more time on your education, refining your own skill sets, and branching out to meet new people who might help you achieve your goals. The more educated, skilled, experienced, and connected you are, the more valuable opportunities you're going to get, which means higher salaries and more options for you down the road, both of which will help you build a stronger financial foundation.
Hunt for under-priced used books that you can sell online. Download an app that reads ISBN numbers so you can scan the barcodes on books. This will pull up the book’s current price on Amazon so you can see if it’s worth trying to resell it. Then, visit used book stores, thrift stores, and garage sales to look for high value books. Post the books for sale online using sites like Amazon or Ebay.
Furthermore you could use a course platform to create and teach online courses on any topic you choose — this is becoming super popular and is something we ourselves do (we have an online course we teach on social media marketing). Either way — most people typically need a platform to accomplish either of these and a blog is typically the easiest way to accomplish that (although that in and of itself can take months to years to really gain traction). We have a blog setup tutorial if you’re interested (just let me know and I’ll get you some good resources).
Just be sure to put a lot of care into your product listings. Everything from the titles you use, to how effective the description is at convincing potential buyers your product is better than the rest, and even taking care to shoot high quality product photos can have a dramatic impact on your sales. I recommend using photo editing tools like Fotor, which gives you the ability to edit your images, create captivating graphic designs and more.
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