Is a 300 euro notebook enough if I only watch Amazon and Netflix films and YouTube?
Yes use one for 260 bought 2 years ago and works without problems
Naturally
In any case
Clear. I bought one for 160 and it works perfectly. What I can recommend to you is to install Linux on old laptops. Here I would like to recommend Linux Mint, because it is very beginners friendly and hardly needs resources to run. With such a cheap notebook, you will hardly experience any disadvantages, such as long loading times, because the operating system does not need such powerful processors.
If you have not yet decided on a notebook, I can recommend that you look for refurbished notebooks (ebay) that have been overhauled but have already been used Refund policy)).
Yes, you can get enough notebooks (new) for 300 euro.