Do you already have an old machine at home or know someone who does? Because honestly, to learn you don't need to spend €300 right off the bat. Start with something more basic - there are simple machines between €80 and €150 that do the job perfectly for someone just starting out. Brands like Singer, Janome or even the generic ones from Worten and Fnac work fine if the goal is to learn the basics. What matters is that it has simple functions: straight stitch, zigzag, and a good instruction manual. Then, when you figure out what you actually enjoy and what kind of projects you want to do, that's when you invest in a better machine.
There's also the option of looking for second-hand machines - lots of people buy them enthusiastically and never use them again, or you see listings on OLX with much better prices. Sometimes you find really good deals for half the price. I'd do it this way: buy something cheap and disposable for the first few months, see if it really grabs you, and then once you have the skill and dexterity for more interesting projects, consider investing in a quality machine. There's no reason to start with €300 if you don't even know yet if it's just going to be an experiment or if you'll still be sewing a year from now.