What makes a design professional?

Honestly, it depends from company to company, person to person. You want a design that is both appropriate for your industry and appropriate for your personality as a business or owner. The key idea to keep in mind is that is needs to follow modern design practices, regardless of your style.

What is Web 3.0? How about 2.0? And 1.0?

It's easier to answer this question backwards, so I'll start with Web 1.0. The World Wide Web was introduced to the world in 1993 (almost 20 years ago!), and it's first incarnation (Web 1.0) lasted until shortly after the Dot-Com Bubble burst in 2001. Pages were largely static, with very little video and crude graphics and animations. Because making webpages was a labor-intensive task, websites tended to be rather boring. Databases were uncommon, and e-commerce was rudimentary. Sometime after the Dot-Com Bubble burst, existing and new web-based businesses had to ratchet things up a bit in order to separate themselves from the growing masses of cookie-cutter sites across the web, and Web 2.0 was born. Characterized by flashy graphics, multimedia-heavy websites, and highly dynamic, database-driven architecture, Web 2.0 is more-or-less what we have today. But Web 3.0 is on the horizon. More of a shift in accessibility than design, Web 3.0, also called Semantic Web, aims to layer the graphics capabilities of Web 2.0 on top of a complex architecture that simplifies access to any type of data anywhere at any time.