Am I allowed to link to Khan Academy for sections of a tutorial for an online game I want to create?

I don't want to spoil too much of my idea, but I've seen how abysmal the state of education in the US is, and I genuinely think Khan Academy is an amazing resource for solving this.

When I was a kid, part of the reason I enjoyed learning so much was because many of the games I played when I was young were educational.

So I figured, why not amplify this? I want to make an all-ages MMORPG where your ability to perform in your "class" (RPG class--think like artificer or bard) depends on your knowledge of its corresponding subject. Bard would require music composition, wizard would require mathematics, etc.

I want to link directly to Khan Academy for the tutorial section of this theoretical game. Would this be allowed? I see it as advertising your site for free, but I wanted to make extra sure it's ok to do.

I reiterate that this is still in theoretical stages, and I haven't publicly announced this project outside of my private friend groups yet.

If collaboration is possible, I'm open to it.