Im a 100% beer and wine guy but I want to start drinking some hard liqour.. Enlighten me..

Whiskey, Scotch, Brandy, Congnac etc.. what are the difference?? They all taste the same to me..

I drink Hennesy and Jhonny Blue occasionally but I really can't taste the difference ..

Why is Whiskey considered as a man's drink and what can I drink that wont give me a headache the next day? something expensive and clean..