Mixing it up is certainly the way I would go about this. If you have no information about the player at all - and the board is only coordinated by having 2 of one suite on it...dont always assume your opponent is flush drawing. I rarely ever slow play sets, i always go for max value - but over betting or being overly aggressive because you are afraid your set will get beaten is not a good strategy. On very coordinated boards - for example say 9spades 8spades 3hearts and you are holding 88 - no matter what you bet on this board a hand like 67 of spades or especially J10 of spades is not folding - J10 is likely raising you in this spot and so the mindset of "i need to bet enough to protect my hand" can certainly be a bad thing.
Sure, you want to protect your holding and get value from it...but you also dont want to over commit to a pot that you are fairly sure you stand a decent chance of losing. Lots of folks cannot fold sets...I play lots of $20 home games where players just will not fold 66 on a 6KA board after the pot has been 3 bet or 4bet preflop by the tightest player at the table. If the 6's lead, they get raised - if they check raise and get raised all in themselves they still snap it off in that spot - no thought process whatsoever. I've folded QQ before after flopping a set because i knew my opponent turned a set of Aces...it sucks, its hard to do...but when it is the correct play to fold, and you can bring yourself to that...your game will improve by leaps and bounds. Making disciplined folds can add alot to your arsenal.
Anyhow, in summary. Play your hand according to player information if you have any - otherwise, go for value, protect your holding but don't try to over inflate the pot because you are scared of every suited board. Check on uncoordinated boards with tighter opponents - or cbet small. Check highly coordinated boards or make smaller cbets to see where you stand in the hand and proceed with caution. Bet average flops or any flop that contains some over cards in it that your opponent may have hit and be sure to size your bets so they can call without much hesitation. Take your time, learn from your mistakes and use your head. Make good decisions and you will be rewarded.
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