You can stay for three months for each six-month period in the whole Shengen Area before you become an illegal visitor.

So, for example, if you want to stay in France, Spain and then Germany for two months in each country, you'll be lucky to escape from Spain without a big fine. And they won't let you into Germany at all, because you violated your three-month Shengen time period.

In fact, you may be banned from Germany and the rest of Europe for up to five years. Your passport can even be stamped "illegal immigrant." That's not what you want on your passport when your plan is to enter a new country several times a year.

So Europe-loving digital nomads have to leave Europe after three months and live somewhere else for at least three more months before coming back to Europe.

Violating Shengen stay requirements is just one of many ways to screw yourself as a digital nomad.