How are Canadian goods imported and sold in Europe?

Alright so... Maybe this is a bit excessive but I have been looking in grocery stores in parts of Germany and France for Canadian brands and goods, perhaps obviously I can't find much. I know a bit about retail in these countries but when it comes to international imports from outside the EU it starts to get murky for me.

Some questions are: 1. can anyone share experience about how large retailers manage to get goods from other countries on their shelves? 2. do you have experience exporting to Europe? 3. Where does one even start to learn about this? 4. And does Canada even need more demand if demand has shifted internally (buy canadian and what not)?