There are a lot of items that can be purchased very inexpensively at garage sales or thrift stores and sold for higher prices elsewhere. A few years ago I discovered that I could purchase good hardcover books at my local thrift shop for $1 or less. I realized that some of them could be sold on for $15-$20, which turns out to be a pretty decent profit.

... Beaucoup de critères d'analyse ont été utilisés pour étudier les PME « particulières » ou « extraordinaires » (Welter et al., 2017) : par exemple le niveau de dépenses de R&D (entreprises de haute technologie [Hirsch-Kreinsen et Jacobson, 2008]) ; l'âge de l'entreprise (des entre-prises en démarrage [Birley et Westhead, 1993 ;Gatewood, Shaver et Gartner, 1995]) ; le type de propriété (entreprises familiales [Fernández et Nieto, 2005 ; Basco et Pérez Rodríguez, 2009]) ; la localisation (les entreprises à domicile [Thompson, Jones-Evans et Kwong, 2009 ;Mason, Carter et Tagg, 2011]), ou le but pour lequel elles ont été créées (entreprises sociales [Shaw et Carter, 2007]). ...

Your Brand Persona and Target Audience. When you eventually start creating content, you have to know who you’re talking to and tailor your brand voice to appeal to them uniquely. If you aren’t targeting the right audience (those people who will lean in to hear what you’re saying), you won’t find success. And, if you can’t find a way to stand out, you’ll blend into the hordes of other brands competing for attention in your industry.
I’ve found that fear often stops aspiring consultants from starting a consulting business–or any business–and on my blog, I talk about how to overcome those fears. I also talk about practical, concrete things you can do to start and run a successful consulting business, along with tools, tips, tricks, and techniques for automating your business and keeping costs to a minimum. The info I give is applicable to most other types of businesses as well.
There are many ways to determine which efforts are producing results and which ones aren't. For example, you can study your website's analytics through your web host or by using Google Analytics. Most social media sites provide analytics as well, or you can use tools such as Hootsuite to get social media analytics. Your email service should also provide you with information on the open rates and engagement rates for your emails.

The internet changes so fast that one year online equals about five years in the real world. But the principles of how to start and grow a successful online business haven't changed at all. If you're just starting a small business online, stick to this sequence. If you've been online awhile, do a quick review and see if there's a step you're neglecting, or never got around to doing in the first place. You can't go wrong with the basics.