It should be noted that a lot of things are still illegal and are being worked on. Two examples:
You are not allowed to share cannabis.
The amount of THC in your blood that would make it illegal to drive is 1 ng/mL blood serum. This is essentially nothing and can, anecdotally, be triggered by losing weight after consuming.
I've had the opportunity to see one of the infamous German drug tests in practice (wasn't driving). The result is that if you used any canabis 4 days earlier it will show up on the pee test. It was waved off as no issue, but four young Dutch people in car got their attention a bit too much apparently. If they thought we were the type they were looking for they had cause to do whatever. We were not the ones they were after though as we were not going to the nearby festival and were just driving by.
Production and trade under very strict restriction in so-called cannabis clubs.
Trade as a non-narcotic medication in pharmacies, restricted to prescriptions.
Production at home, with very strict limits towards quantity of plants and size of harvest.
Possession of limited amounts of cannabis and thus public consumption with restrictions regarding proximity to institutions for children.