commands for thee command blocks (that are boss)

hello today im going to teach you about command blocks
command blocks are like the commands you can use in the chat bar cept the commands only activate if redstone is turned on.
you cant find command blocks in the gamemode 1(creative) invatory or craft them. the only way to get them is to spawn them in with the give command:ie /give INSERT NAME HERE 137
you can make command blocks do many things like a TARDIS(later post)and stop rain. just right click the block and typ in a command. Add some redstone and bam INSERT THINGAMAJIG HERE
CEE YAH