This is about teams,shops,how to summon mobs with effects and how to detect teams and mobs.

shop
cmd 1 /give @p[lm=4,r=6] 373 1 16373
cmd 2 /xp -4L @p[lm=4,r=8]

Detect Mobs: testfor @e[type=Zombie,r=20]

Team Detector: testfor @p[team=BLUE,r=3]

Zombie with a effect: /summon Zombie ~ ~1 ~ {ActiveEffects:[{Id:10,Amplifier:655,Duration:32167,Ambient:1}]},CanPickUpLoot:true

How to make teams: /scoreboard teams add <team name>
How to add colors for teams: /scoreboard option teams <team name> <color>
How to join a team: /scoreboard teams join <team name>

This is how to get items with discription,names and enchantments:
Custom Name
/give @p minecraft:itemnamehere 1 0 {display:{Name:"namegoeshere"}­}

Custom Description
/give @p minecraft:itemnamehere 1 0 {display:{Lore:["descriptionhere&qu­ot;]}}

Custom Enchantments
/give @p minecraft:itemnamehere 1 0 {ench:[{id:enchantmentidhere,lvl:enchant­mentlevelhere}]}