I was referring to the tutorial popups in the inventory menu. Good to hear there is a way to transfer items faster. The training hall is also a good idea, though maybe there should be a way to access it even if not in town?
I would suggest tutorializing mechanics as they are relevant. For example, I didn't collect any key items during my playthrough, so you might include a tutorial for reaching that menu after the player has received their first key item, rather than at the very beginning. I think people also learn better by doing, so you might have the game explain what something does, and then having the player do it afterwards. That way they may retain the information better.
Good luck with your project.