Minecraft is a game where you can go caving, defeat the ender dragon etc. You can either play in survival or creative. In creative you are open to every block and you are also able to fly. In survival you spawn with nothing and you have to find stuff your self. To start off you should probably get some wood and make your self simple wooden tools. Before night falls make you a small house and make your self a bed. When night does fall sleep through the night to avoid zombies and skelatons and creepers. You should probably go mining soon and get some stone tools then make a furnace get some iron and  smelt it then make some iron tools. After that you can start on the big stuff.