"YOUR" and "YOU'RE"
"Your" indicates possession. "You're" is a contraction for "you are." Ex.: Is this your umbrella? You're a wonderful person.
"LED" and "LEAD"
"Led" is the past tense of the verb "to lead." "Lead" can be a verb meaning to guide or a noun referring to a type of metal. Ex.: She led the team to victory. He will lead the project. The pipes are made of lead.
