If you passed the Basic Commands, then you are ready for Intermediate Commands! These commands have lots of effects than basic commands. Here are some of the Intermediate Commands:
/summon Giant A TOP SECRET command, summons a giant zombie
/summon EnderCrystal Summons one of the Ender Dragon's healing crystals
/summon EnderDragon Summons the great boss of the End
/give @p {player's name} head Gives you a head
/summon EnderCrystal Summons one of the Ender Dragon's healing crystals
/summon EnderDragon Summons the great boss of the End
/give @p {player's name} head Gives you a head