What's a More "Advanced" Topic You'd Like to See on DEV?

As a member of the DEV team, I love reading what our community is writing. There's career advice, "meta topics", walk throughs, how to posts, and even why to posts.

I'm wondering what are some more advanced topics you'd like to see? My thought being perhaps responses to this post can prompt our community members to read and say "Oh, I know more about that and folks are interested."

And something to remember, each of us are at different stages along the many paths that we take in technology. Advanced to me Ruby posts are quite different from advanced to me Javascript posts.

So let's speak out about our curiosities, and see about helping each other level up.