Question about post flop experts.

[beekeeper]

I hear commentators on poker shows talk about professional players "outplaying" nonprofessionals on the flop. I thought I knew what that meant, but the more I learn about the game, the less I think I know.

What are ways in which a better player can outplay me after the flop?

I'd like to mix up my play more, play a wider range of hands, and not bet so predictably, but my competitors seem to know when I have a modest hand.

thanks