The Genshin manga can potentially have spoilers. It might show events or details that haven't been encountered in the game yet. It's best to approach it with caution if you're worried about spoiling your game experience.
Well, the spoilers for a manga like this could involve plot twists like finding a unique diet method that works wonders or facing setbacks that make the journey more complicated. Maybe there's a surprise friendship that helps with the diet too.
The Attack on Titan movies can have manga spoilers. This might happen if they want to add more depth or take a different direction. But it's not always the case; some might stick closely to the manga without giving away too much ahead of time.
I don't think One Piece Red has major manga spoilers. It might hint at some future developments, but it doesn't give away crucial plot points that would ruin the manga experience for you.