If I want to sell bitcoins, assuming I was successful in either buying them or selling a service or a product and accepting bitcoins instead of normal cash. How can I convert the bitcoins back to cash ?
Another option would be to use an exchange which can withdrawal USD/EUR (depending what you want). A good option for that is Kraken, as they have very low withdrawal and trading fees. You can trade your bitcoins to USD/EUR, and then withdrawal to your bank account. And no, I am in no way associated with Kraken, just a happy customer there