lalalalalalala (:

STOCK: A stock is a share of a company. You can use it to make money, so when the stock value goes up that's when you make your money, and when the stock value goes down you lose money. 
DIVIDEND: I'm not actually sure what a dividend is. But I think is has to do with the company paying the shareholder for some reason. 
TRADE: A trade is when you buy a stock and only plan to keep it for a short amount of time. A trade doesn't generally make as great of a value as investments, but trades are normally to buy when you know that there is going to be a drastic increase in value due to a special event or something, then you get rid of the stock after you make the money you were expecting, or in some cases more or less. 
CATALYST: A catalyst is anything that can affect a stock either positively or negatively. You mostly use them to make money in the stock market, but it can either increase or decrease the values of your stocks depending on the circumstances.