Basic Command Blocks 1.7.9

COMMAND BLOCKS
are useful blocks for Mini Games!
you can get yourSelf By typing

/give <player> 137
or in 1.8
/give <player> minecraft:command_block

Now lets make a CommandBlock to Change Time
Items*

2CommandBlocks
2Blocks
2Buttons

Start off by place 2 CMD(Command) Blocks
Then Place the 2 Block, Infront, Behind, Right, or Left of the Command Block
On those Blocks Place a Button Right Click on the CMD Block
and type each 1 in a Diffrent CMD Block

/time set 0

/time set 15000

Or type

/Weather clear
/Weather Rain

Or type in only 1 leave other 1 Blank

/ToggleDownFall

Next We are going to be Looking at SetBlock

/setblock ~ ~ ~ 1

Put that in a CMD Block and add a button that should Change the
CMD Block to Stone

/Setblock <Cords> <ID>

ScoreBoard is Really Important for a lot reason type in these command from your player before strating


/scoreboard objectives add <name> dummy
/scoreboard objectives setdisplay sidebar <name>


Then get a CMD Block and type in 
then type
/scoreboard players add <player> <name> <numeric>
Finaly Put a Button
and Press a SideBar Should Come

   <name>
<player>

Next Lesson  to summon a zombie up in the sky and fall into a web and go down with a command block

1 comand Block
1 Cobweb
1 pressure plate
1 Block

First, place the command block
Second, add the command
/summon Zombie ~ ~10 ~
The object name is Case-Sensitive
Then, place a block above the command block above the block put a pressure plate
Finnaly, place a cobweb 4 blocks high

This Last tutorail will be command block talking to each other

1 Anvil
As many Command Blocks
same amount of repeaters as command block
Same amount of repater as command blocks -1

Name a command block a name with the anvil
Name other command block another name
Example:

CommandBlock Name: Ron
CommandBlock Name: Notch

Then place the power source connect it to
a command block (With a name)

In that command block type in

say [Msg]

Example:

say Hello Master Notch
place a repeater after the commandblock
 Now the other commandblock
say [Msg]

Example:

say Hello Elder, Ron

Continute the last 3 steps