I created this post to probe common hobbies which require little or no money to enjoy/start. I have one which is writing (English is not my native language) and I'm planning to buy a cheap fountain pen to try something different (used ballpoint/rollerball pens my entire life). In the near future, I think that I will dedicate my time to do very simple carpentry projects (electric tools are expensive and require plenty of space to store them [It'd be nice to rent a place with tools to do my projects now and then]). I also enjoy taking care of a tiny window garden I have (I live in an apartment and I plan to move to the countryside in at most 5 years but that's another story).

Edit: expanded the text a little bit.