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human
[Dr Strange] When the sling rings are introduced, it is said they allow travel throughout multiverses. So....Strange can just go to any timeline he wishes?

 So when they introduce the Sling Ring, the Ancient One says that it allows them to open portals and travel to multiverses, right?

And in Marvel, a multiverse is basically an alternate universe with their own set of Marvel heroes. So, can Dr. Strange go visit the X-Men or Fantastic 4? Can he go into the "future" of a timeline to check if Thanos wins? 

In the movie it looked like it only focused on getting from point A to point B on earth/mirror dimension. So I was a bit confused why he wouldn't use it to its full potential.
gpt
Multiverses nest. Just like you can have multiple continents on one planet, multiple planets in one solar system, multiple solar systems in one galaxy etc. you can have multiple universes within, for lack of a better term, a universe. They really should name those things better, but while the sling ring could take you to the mirror dimension or the astral dimension or many, many others, all of those are still within Earth-199999. Not that it would be impossible for him to reach Earth-616. But it would take more than a sling ring.