Jack of All Trades

...master of none? Phrase used to describe a versatile person that has some knowledge / experience / skills in a variety of different jobs or disciplines. Kind of an amateur Renaissance Man.

Of course, the second part of the phrase, "master of none," indicates the trade-off of knowing a little bit about everything: it's difficult, to say the least, to know much about any one thing if you know a little about everything.

Sometimes the phrase is used to praise, and sometimes it's meant to damn. It's all about the context.

"Jack of all trades, but master of none", was the phrase used to describe the bard PC class in the 1st edition AD&D player's handbook.

Problem was that bards quickly rose above the restraint of this phrase. Game designers drafted bards as an afterthought and didn't look far enough ahead. In the hands of a number crunching player, a bard became the MASTER of all trades, with comparably low XP. This trend/feature continued in all D&D editions until it was "fixed" in 3rd edition.
"patient bard" means "god" in the language of all munchkins.