NLHE-TAP confusion; don't c-bet?

[lairnair]

Apologies if this is the wrong forum.

In the "Bet Sizing" chapter of <u>No Limit Hold 'Em - Theory and Practice</u> first the authors discuss how to size your bets assuming you have the best hand. Then they go on to discuss the situation when you might not have the best hand, and they say: "Checking is usually best if you aren't the favorite, and you act last." They define "aren't the favorite" basically as "there is more than a 50% chance that you are either behind or will be outdrawn" (so you could be ahead and not be the favorite, obv.)

Are they saying not to c-bet unless you have the nuts? Obviously you wouldn't c-bet if you knew you were way behind, but doesn't the advantage of acting last make it correct to c-bet when we might be behind? Am I missing something here?