Use "too many" when talking about an abundance of multiple things. "There are too many people in the elevator." "They have too many players on the field." "The waiter is trying to carry to many glasses on his tray." "Too much " is used when talking about an abundance of one thing. " I ate too much food. " "Robert has too much money." "I don't have too much money!" "Children eat too much candy." Hope that helps a little.

A good answer above, but from a grammarian point of view, there is more to it than that. In fact, it's very similar to the "less" vs "few" rule. You use "many" when the item is a noun that can be counted. For example, "money" is not countable, so you cannot say "I have many moneys." (Of course you COULD, but that indicates many TYPES of money, and not "a lot" of dollars, for example. It would have to be money from other countries). This leads to my next point: you use "much" when the item is not countable. Seeing how you can't really say (without making much sense), "I have three monies," you use "I have much money." Similar examples would be the use of the word "candy." "Candy" is a collective, or a countable, concrete noun. You can either say, "I have much candy," (to which you could reply with "how much candy do you have?") or you could say "I have many candies," (to which you could reply with "how many candies do you have?"). If the word is collective, which means that it contains a number intrinsically (per se, if you will), then you use "much." If the number can be counted (1, 2, 3, etc) then you use "many."

Simply put: Too much salt - uncountable noun. Too many people - countable noun. Or remember this as your language guide: Too many women. Too little time