No single "code list"—Minecraft uses commands (single/multiplayer) and cheats (subset for easier play).
Type / + command in chat.
/help – List commands/gamemode <mode> – survival/creative/adventure/spectator/time set <0-24000> – Set time (0=dawn, 24000=dusk)/weather <clear|rain|thunder>/kill – Kill targeted player/tp <target> <destination> – Teleport/give <player> <item> [amount] – e.g., /give @p diamond_sword 1/summon <entity> – e.g., /summon creeper/setblock <x y z> <block> – e.g., /setblock 100 64 100 diamond_blockFull list: Minecraft Wiki. Cheats reduce challenge but enable creative experimentation.