Teleport
This command teleports one player or multiple players to a certain point.( Note: you can also teleport entities with @e but you may not teleport to any entities )
If copying these commands in your chat, only copy brackets, not parenthesis
/tp (target) (destination)
/tp (destination)
Fill
This command allows you to make a big block of whatever
/fill (current coordinates) (end coordinates) (block) (block variant) (fill type)
Kill
This command removes specific entities from the game.
Target can only be a player or @e.(Note: Armor stands are entities and will be removed if you type /kill @e)
/kill (target)
Execute
This command allows you to use another player to run a command for you
/execute (target player) ~ ~ ~ (command)(command NBT data)
Enchant
This game allows you to enchant the item in your main hand(provided it can be enchanted)
/enchant (target player) (enchantment) (enchant level)
Give
This command gives you any item you request.
/give (target player) (item)
Effect
This applies a potion affect to any target.
/effect (target) (potion effect) (duration) (amplifier) (hide particle boolean(True/false))
Gamerule
This changes certain setting without going to the settings menu.
/gamerule (rule) (true/false/amount)
Say
This will type something in chat.
/say (message)
MSG
This allows you to privately message one member of your server without others seeing it.
/msg (target) (message)
That should be most of the simple commands that will help you create and destroy.