In Minecraft PE, there are commands/cheats. Commands make things happen that don't usually happen in the game. To do a command, you go to the "chat", and type in the specific command.
Here are two easy commands: "/give @a stick #". This simple command gives you a stick, or whatever item you want, however many you want. The "@a" means all players. The number sign is where you put how many of the item you want, from 1 to 64. So, for example, if I wanted 64 enchanted apples, I would put in "/give @a appleenchanted 64". If you want 5 Ender pearls, you would put in "/give @a ender_pearl 5". If you want 64 pieces of obsidian, you would type in "/give @a obsidian 64". You can do this for whatever items you want. For tools, and swords, you can only get one at a time.
Another one is "/summon zombie", or whatever you want to summon. You can summon a minecart, boat, ender_crystal, or whatever entity you want by putting it in place of the "zombie" in that command.
There are tons of possibilities with commands, like the lightning snowball. Here is how you make the lightning snowball. First, get a command block by typing in "/give @s command_block". The "@s" means yourself, instead of "@a", all players. Then make the command block a repeating command block, and place the lever, and type this in: "/execute @e[type=snowball] ~ ~ ~ summon lightning_bolt". Make sure to activate the lever. The "~'s" are the position, (X, Y, Z). "X" means East/West, "Y" means high/low, and "Z" means North/South. With just the regular "~'s", the location of the lightning bolt is (0, 0, 0), which is how far away it is from the snowball. If you want the lightning in a different place, decide where you want it and type in the (X, Y, Z) location after the "~'s". For example, if you wanted to have the lightning bolt this far away from the snowball: (1 block East of the snowball, 5 blocks above the snowball, 25 blocks North of the snowball), you would type in the command like this: "/execute @e[type=snowball] ~1 ~5 ~25 summon lightning_bolt".
Now here is a command that is kind of mean for your friend. This is how you make your friend explode. First get the normal command block by typing in "/give @s command_block", then place it, of course. Make sure the arrow is facing the left, and type this in: "/execute ike06 ~ ~ ~ summon ender_crystal". And make sure to type in your friend's name, instead of mine, ike06. Then place a chain command block to the left of the command block, and make sure the arrow must face the left as well. Then, type this in: "/execute @e[type=ender_crystal] ~ ~ ~ summon arrow". Place the lever on the command block to the right, and activate it. Now watch your friend explode!
That's it for today. Next time I will give you even more commands for Minecraft PE.