[nynno]

My favorite website is this: https://ico.org.uk/for-organisations/data-protection-reform/...

They have explained GDPR in reasonably everyday language, with checklists and examples. That site should be your first choice.

If you are a developer, you should check https://github.com/gdprhq/GdprHq.Io.ClientSdk - you can find interfaces and default implementations. For example, to implement the right to erasure (to be forgotten) in your app, you'll need to erase personal data and to inform an individual that you've done so. Even though actual erasure might be tricky, at least you know what you need to implement to be compliant. However, note that having the app GDPR compliant isn't the same as having the business compliant; primarily, GDPR is a set of rules and processes that apply to organizations.