Question regarding raised pots

[daxtrader]

Say you raise on the button with 5,6 and flop something like 5,5,9. You bet out and get raised. At microstakes and even at small stakes, is it okay to felt this 100% of the time for 100bb? 200bb? 300bb?

Say you flop top two and opponent flops a set, is okay to just get it in? Do close spots like these really matter long term? Is it a general rule to shove any hand that beats top pair in a preflop raised pot ?