Definitely does NOT have an A in it.
That is definitely spelled wrong.
Grammar does NOT have an e in it.
It is also not to be confused with "spelling," which seems to be a lost art. Grammar refers essentially to syntax and word usage.
Grammar is NOT a kind of cracker.
Your denotes possession.
Your team sucks.
You're means you are. It is a contraction, between YOU and ARE.
You're a fuckwit.
There means a place, stage, moment, or point.
Look over there.
Stop there, before you embarrass yourself.
Their denotes possession.
I own their shirt.
They're is another contraction, between THEY and ARE.
They're fucking good.
To is a preposition.
I'm going to Boston.
Why would you want to do that?
Who the hell are you talking to?
(You're not supposed to end a sentence with a preposition, but fuck off. It's for the sake of the example.)
Too is synonymous with "as well" or "also."
I've seen them, too.
Good is an adjective which describes a noun.
This is good pizza.
The new cd is good.
Well is an adjective which describes a verb (otherwise known as an adverb).
I don't feel well.
I didn't do very well in high school.
"Lil" is not correct. Little is the proper term.
I have little patience for bad grammar.
u and ur are also not acceptable. Use "You" and "You're"
When in doubt, http://www.dictionary.com and http://www.thesaurus.com are your friends. Don't forget Spellchecker, either.