Another good learning material for Composing and Arranging that I always highly recommend to everyone, are these mini lecture videos by Alan Belkin: https://www.youtube.com/playlist?list=PLSntcNF64SVVhPiEzHVIjIP0TvutZhK8J
He uses notation examples in the lectures, but even if you don't really read sheet music that well it's easy to follow along (for example, I'm really bad at reading sheet music😂).
Alan Belkin's lecture videos have taught me A LOT of what I know about composing and arranging music, so I really recommend you or anyone reading this to checking them out if you haven't before, maybe they can help you as much as it they've helped me 😄.