I think it's really cool that dark mode and light mode look different, i'm enjoying this website so far and I want to learn more about it as well as Minecraft as a whole.
Recommend anything for somebody who wants to kill Enderdragon in survival as a starter?
Prepare as much as you can, take your time, set a base in stronghold and set a bed to respawn there. Also, prepare for many cobblestones and arrows, you will need them. And a good pickaxe and a good sword if you can.
Edit: this is my recommendation for a starter, but if you are not a starter, you can just use the bed exploding method. It can be found in YouTube.