How to sell online: build a website or sell through large marketplaces?

When we approach online selling we often have these questions we need an answer to:

• What can we sell online?
• How do we sell it?
• How much can we sell it for?
• How can we open an online shop?
• Are we better off selling on Amazon and eBay or having our own web presence?

Learning how and what to sell online is not easy, you need to know where to sell it, what is the right price, which…