The trade of driving taxis is now open to any driver with a car and a smartphone.

Babysitters and dog walkers no longer have to post flyers on telephone poles to advertise their businesses.

And reselling items youve previously purchased is no longer relegated to yard sales and flea markets.

A man boxes up books.

Tina Russell/The Penny Hoarder

But how do you know what to sell?

If theres a product, theres always at leastoneperson willing to buy it.

7 Ways to Make Money if You Hate People

Do you avoid people too?

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Enough small talk.Here are some waysto earn extra cash, without all of the social stuff.

So how do you know which product to sell?

You should also do some research into Amazons Best Sellers Rank, or BSR.

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Products are assigned a rank (starting at #1) per category.

Does that mean you should only invest in the #1 best sellers?

One caveat: This is not an exact science, and it does vary from category to category.

Beware of the Extremes

Selling in an untapped market can be highly rewarding but its risky.

At the same time, buying a bunch of products in high demand can also be unwise.

That means you could be sitting on those frying pans far longer than youd like.

Hope you like eggs.

Amazon also has gated entire categories of products.

If you want to sell those products, youll need Amazons official permission to do so.

The Selling Guys offers agreat resourceto get you started.

And when yourenotselling through Fulfillment by Amazon, youre on your own to coordinate all your shipping.

Either way, youre going to have to pay to ship your products.

This makes clothes, jewelry and small kitchen items especially appealing to sellers.

Brand names are likely to sell for high prices to the right buyer.

Exercise attire and undergarments tend to be more popular.

Here are a few things you should remember:

2.

Electronics

Everyone loves to get their hands on the latest gadgets.

In fact, theyre probably researching your productsonone of their new electronics.

(Remember, books were how Amazon got started!)

you’ve got the option to find cheap books at used bookstores and library sales.

The best part of the baby market?

Holiday Decorations

Its a similar story for anything holiday-related.

That means kitchen appliances, utensils and decorative home goods.

Think: accent pillows, throw rugs, knick-knacks, succulents, etc.

Items like these sell well on Amazon.

These typically have BSRs that make purchasing them worth the investment.

Toys

Parents are increasingly turning to the internet for toys, especially when it comes to Christmas shopping.

Jewelry

Jewelry is in high demand, but its also a saturated market on Amazon.

The best way to succeed is to find unique jewelry that lends itself tolong-tail keywordswhen tagging the product.

Doing so will help you find more niche buyers in a less competitive segment.

When you do find the right product for the right buyer, you might typically achieve a high ROI.

He lives in Ohio with his partner and their three-legged dog.

(Can you sense my millennial sarcasm there?)

You know which ones were talking about: rent, utilities, cell phone bill, insurance, groceries…