The beginning of a garden always has surprises. I have had my garden for 20 years and learnt a lot, but it starts with a seed that germinates. Often other unwanted plants germinate as well, but some can be interesting.
And then you can get adventurous and decide to grow a avocado tree (in Switzerland?). Of course you keep it indoors and might even be successful.
I would not really recommend it. Your avocado might give up, or even get attacked by some unknown invader in the pot. Many are the avocado trees I have grown and disposed of. Now I eat the fruit and dispose of the pit.