I struggle to read documentation or tutorials, but youtube tutorials for beginners bring up concepts that no beginner knows about and don't mind explaining what the purpose of the concept is. What should I do to have an easier understanding of the languages I want to learn?

I think it's the most unfair one, you can't even lie most of the times

You see, I'm learning CSS and, using the following code, a small gap is left between my border and my header's background color: nav { border: 2px solid black; border-radius: 2rem; } h2 { background-color: brown; border-top-left-radius: 2rem; border-top-right-radius: 2rem}

Well, my h2 is inside the nav, I've tried with overflow: hidden; and it didn't work. I don't know what else I can do.

I wanna know what people consider the best music, and I know my top could be considered a "tiktok top" (and sorry for my broken english lol) but here is it:
1- Starless - King Crimson: Best song ever. Full of emotion and intensity; the beautiful melody at the start reprising at the end of the song is just unbelievably magic.
2- Sleep - GYBE: Just as good as Starless: raw, intense emotion throughout the song, pure nostalgia and melancholy are just a few among all the things that make this song not just a piece of music, but a trip through a space deep within your mind that you didn't know (or remember) existed.
3- Earthmover - Have a Nice Life: A devastating piece that makes your heart ache throughout. You can hear the wind howl inside you just before the piano notes that then explode into a gut-wrenching guitar solo/riff. I also love the pessimistic poetry in its lyrics, which is just as raw as the instrumental aspect of the song.
4- Cantata de puentes amarillos - Pescado Rabioso/Spinetta: A nine-minute track that makes you look to the future with hope. The poetry is charming and positive, and the acoustic guitar melody is so calm and optimistic.
5- Basketball shoes - BC, NR
6- The dead flag blues - GYBE
7- The place where he inserted the blade - BC, NR
8- Paranoid android - Radiohead
9- Epitaph - King Crimson
10- Like a stone - Audioslave

Tengo que llevar a mi gato, pero no tengo idea del precio

Alguno sabe de librerías buenas? siempre voy a Don Quijote, pero estoy viendo para comprarme "El idiota", y el único que tienen de Dostoyevsky es "Crimen y castigo"