Website design isn't all about being over complicated. A website should be kept simple, works effectively and is eye catching. All websites are built to high standards with most web pages complying with W3c (World Wide Web Consortium) standards:

All websites are tested in commonly used browsers. All designs would have to be approved by clients first to make sure they're happy with what I have produced.

E-commerce websites are built either using agents like PayPal, WorldPay, etc or through software specifically built for designing shopping websites.