Could you please explain how you made your quests look like that (visually)? Is it done by modifying the mod’s assets, or are these built-in features? So far, I’ve only figured out how to change the frames and the background. Thank you in advance.

I’m also a modpack creator — and of a fairly large one — and I really need to make it just as beautiful, but with my own style.

I’d like to mention that I’m a Russian speaker, in case that makes it easier for you.

In FTBQ, in editor mode, you can right click and add an asset (image). Most of the images used in the background are just assets from the mods already included, and since they're all nice pixel art, it cuts down on total assets used for the quest book. There's nothing else to it, we just have an amazing dev that is super good at making things look, well, good!

How can I make arrows between quests?

I really liked what you did — I’ve never seen anything like it before!

Those are a bit more advanced, that I'm not 100% sure with. You're welcome to dig through the repository here to find those assets. They're probably in something labeled with FTBQ.

look like here actually: https://github.com/TeamAOF/Craftoria/tree/main/kubejs/assets/ftbquests/textures

dont think it actually matters where the assets are, FTBQ can still access them.

Now, I shouldn't have to say it, but any assets there that aren't a default mod texture from one of the mods (that you'll end up installing in your pack) should not be used by others.

Thank you very much.
I knew about the copyright. I'll write to you if I need to.