If you’re serious about making money selling things online, it’s pretty much impossible to not recommend Shopify. The platform gives you everything you need to get your online store up and running in less than a day including a custom domain, beautiful templates (so you don’t need design skills), secure payment options, and they can even take care of marketing and shipping for you. Whether you’re promoting your own products, designs, or curating other products for people in your niche, Shopify is the best option for powering your online store.
eBay: eBay is one of the most popular websites in the world, period. That means it’s a great way to attract lots of eyeballs to your unwanted items, fast. Initially designed as an auction site for DIY sellers, it’s now primarily a venue for fixed-price (though often heavily discounted) sales by professional merchants. Still, as long as you include high-quality photographs and thorough descriptions in your product listings, you can likely break through the noise. eBay’s fee schedule is complex, but as a general rule, expect to lose 10% of your final selling price to the site’s commission.
Most of us are guilty of hanging onto things that we never use, myself included. Take a day and go through all your old stuff and get rid of some of it! One tool that is really helpful for this is Decluttr. You can enter your items barcodes into their valuation engine and they’ll give you an instant offer. Then you simply pack all your items into a box and ship them off for free.
Write a blog. If you have a business, consider starting a blog as part of your marketing plan. You can write how-to articles, product reviews, answers to questions and posts about upcoming events. Blogs give you more flexibility than other forms of social media like Facebook or Twitter because you own the content and aren’t bound by a third party’s rules or restrictions. Also, if your posts include keywords or phrases and link to internal and external content, you can improve the search optimization of your website. Blogs drive sales because you can include product information and links to product pages. 
Walk around your neighborhood or town and I’m sure you’ll see tons of great local businesses with terrible design. However, with increasingly easy-to-use tools like Adobe Illustrator, Venngage, Stencil, and Visme, just about anyone with a creative mindset and a good amount of motivation can start making money online by being a graphic designer for local companies.
If you’re looking for inspiration, my friend Michelle Schroeder-Gardner of the website Making Sense of Sense has become the expert on all things affiliate marketing. Michelle earns more than $100,000 per month from her blog and the bulk of her income comes from affiliate sales. Michelle has had so much success with affiliate marketing that she even has her own course called Making Sense of Affiliate Marketing.