[Dominic]

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would someone kindly explain this concept, and how it affects the betting of a semi-strong hand?

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Ok I'll try to give you an example. Lets say that a tricky aggressive player limps in utg and you raise with QQ and everyone folds and the player calls. Lets say the flop comes out A 8 4. He checks and you bet and he calls. The turn is a blank, and he checks again, you should consider checking behind also since you are either way ahead or way behind and only the king would be a bad river card for you. By playing your hand this way you avoid being checkraised on the turn and possibly folding the best hand or calling down drawing to two outs, and plus you may induce him to bluff the river or even call the river when he mightve folded the turn.
Heres another example of a hand i just played yesterday, I raise with JcJs utg, 3 people call including a loose aggressive player on the button and both blinds fold. The flop comes out Qc3c3d. I bet, two players fold and the Loose aggressive player calls. The turn brings the 6c. I now check partially becuz i now have a club draw and partially becuz im in a way ahead way behind situation and the villain cannot have AK since he wouldve reraised preflop, so im not worried about an ace or a king hitting the river since at worst only one of those cards can beat me. So I check the turn, and the villain bets, and I call, the river is a total blank, I check, the villain bets and I call and he turns over A8 for a total bluff. By playing my hand in an awkward fashion I got the villain to bluff off 2BB, and i also avoided the uncomfortable situation of getting popped on the turn. In many WA/WB sitations the correct strategy is usually to check and call, but keep in mind that these situations usually only apply to heads up situations. And if you are against weak predictable opponents who would never raise you without the goods but will call you down with very weak hands than you should be betting to collect more money since you can safely fold to a checkraise. Against these type of opponents checking decent hands cuz you are in a WA/WB situation will just cost you money.

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Again, thanks - makes total sense.