I found YouTube a bit overwhelming trying to work out where to start!
@Vitamia Check out the Calm app. They have a 7 Days of Calm series which is an introduction to meditation. I did buy the subscription after that so I’m not sure how much free content there is. But it’s a good introduction anyway and then like Mandi says there is tons of stuff available online.
There are a few threads on here with links to meditations, here are a couple:
https://talkingsober.com/t/simple-short-guided-meditations-for-beginners/17704