MCU = Marvel Cinematic Universe
The comics are canon. They follow them if possible. There are some deviations.
Marvel Phase 1 Movies
Marvel Phase 2 Movies
Marvel Phase 3 Movies
Infinity Stones aka Infinty Gems or Orbs
There are 6 stones. There is also an Infinity Gauntlet that can hold all six.
Whoever has that is going to be the big bad. (As you can see, Thanos is who is going to get it.)
Marvel TV Shows