What happened at the end of Kingdom Hearts 1

Well you have to fight Ansem a lot of times and he ask for kingdom hearts to fill him with the power of darkness. And a beam of light shoots out and that's the end of Ansem. Riku and the King are in kingdom hearts and they help sora close the door. And Sora sees Kairi for the last time and it's all dramtic. Then the credits come on. After that, sora,donald, and goofy are walking on a cross road and they see this dood in a black hood. He says you will loose something dear. Then Sora goes to a castle and the rest is in Kingdom Hearts Chain of Memories Enjoy!