I'll tell you a secret. You don't have to know any of them well. You just need to be able to do a days good work (or heck, a quarter of a day) and you'll be ahe

I'll tell you a secret. You don't have to know any of them well. You just need to be able to do a days good work (or heck, a quarter of a day) and you'll be ahead of most of your competition. I am sure this goes for most white collar work.