The UK's ICO also has a good structured summary: https://ico.org.uk/for-organisations/guide-to-the-general-da...
In general I agree with the sentiments in this article. I've probably spent a total of three to four days reading around the GDPR and I don't really see what's special about this law other than it's imposing decent standards on what was in effect a wildly unregulated industry in people's personal data. If you have a broad distrust of any government activity then I suppose any new laws with "fines up to €X" might feel like "I run a small site on a Digital Ocean droplet and I'm at risk of a €2m fine out of the blue." But that doesn't make it true.
It's not a minimum.
You'd have to be a consistant repeat offender, with no effort made at remediation, with no cooperation with the regulator, and probably handling sensitive or financial data.
Here's a list of recent actions taken. I think the current maximum fine is £500,000. Have a look through a few of these hopefully it's somewhat reassuring.