Hi Mathias! Welcome to the club. I used an AI to translate this message so we can understand each other better.
My biggest advice for beginners is simple: don't overdo it. Many people start giving too much water or too much fertilizer and end up stressing the plant. Always wait for the soil to be nice and dry on the surface before watering again.
Get some good seeds and make sure they have the right light, that's already half the battle. The best way to learn is to open a diary here on GrowDiaries, so we can help you if you see something strange.
Good luck with your first cycle!
Happy Growing Growmie 🌱