Once you play through the opening, and progress through the middle game, you reach the end game. This tends to be a very simplistic position. Sometimes, both queens are missing from the board. Other times the queens and a few pawns are all you have left. Regardless this is a very important phase of the game.
This section of the Chess Geek website will provide common End Game positions and ideas to help you go from a even position to a win. Read and watch about the various topics, and good luck!
Enjoy single videos to learn the endgame, or a complete masterclass below: