Looking for ETF advice: best option for long-term investing?

I'm 21 and I've decided I want to start investing instead of letting my money sit in my bank account. I have around €1,000 that I can invest right now, and after that I plan to invest €100–200 every month consistently. I'm not interested in trading, day trading, or trying to pick individual stocks. What I'm looking for is something simple, ideally an ETF or index fund that I can buy, keep adding to every month, and hold for the next 10–20+ years without having to think about it much. If you were