If you believe what most gurus will tell you, starting a business online is a piece of cake. Unfortunately, I know (from experience) that there are a lot of easy mistakes that one can make.

For example, most business owners spend far too much time focusing on the look and feel of their website, and not enough on marketing and promotion. There's no point of having an amazing looking site if no-one's visiting it, so even a poorly designed, horrible looking site that gets traffic is better than one that looks great but doesn't.

Another thing that most people don't realise is that their landing page should be part of the sales process. People make 'buying' decisions based on emotions, not logic. The best copywriters in the world realise this and use it to their advantage. You can't convince someone to buy someone - you need to appeal to their core desires and emotions. You need to give them an insight into how purchasing your product will make them feel or make their life better.

Also, most businesses fail to build a real relationship with their customers. Building a strong relationship with the people that buy your products is a good idea, as it means they're more like to buy products that you bring out in the future, and they'll provide you with ideas to make your current products better (providing you ask them). In addition to this, if you treat them well, they'll speak highly of your business, which will help to improve the overall image of your company.

Lastly, a lot of people don't stick to a proven business model. Just because we're doing business online these days, doesn't mean that the core fundamentals of business have changed drastically. In fact, they're exactly the same as they've always been. Offer quality products, promote yourself vehemently and try to make sure your costs are lower than your revenue. These are the things you should be focusing on when doing business (either online or offline).