According to German law every website who is owned and operated by a person or entity in Germany needs an imprint with full name, address, email address and phone number… (of the owner 2 owning entity)…
b) You need a valid postal address where you can receive mail but this doesn't have to be your home address. A PO box is fine.
c) You don't need to have a phone number in your Imprint.
The base requirement of commercial operations having to have valid contact information (that can be used for legal communication) is pretty sensible. The details could be a bit friendlier towards individuals running purely personal sites.
A freelancer's sites are also considered commercial use.
And such sites without imprint have been fined & taken down.
If you engage in commerce, you need to publish enough contact information that others could serve you a court summons.