One of the biggest mistakes that owners of the online shop do, is that they
copy the details of the stuff from other online shop into their own. clients
are not stupid. They visit many websites and they notice it, when they see
the same description in two different online stores.

Also remember to check the spelling of every text, you place in your
online
shop. You can use
online shop software to check it. And do not use jargon.
clients detest to read information about stuff in jargon. Some of them may
like it. But the majority dislikes it. They get impression that you are not
serious. Also they may even think that you are not an adult and they will not
purchase products from your
online shop, because they would be afraid that
your
online shop is a fake. If you believe that people from other countries
will also visit your
online shop then try to translate your website into
other languages. The most common is, of course, English, But you could also
try with French, Spanish or even Polish, Japanese. Hire professional
translators in order to do that. You can easily find an
online shop
translated into another languages that is full of spelling and grammar
mistakes.