Too general. Better to post a few hands where you checked the river but think you might have been better betting (or vice-versa).
I'm going to assume you're playing micro stakes since this is in learning poker. Learning how to bet the river effectively is a skill that few micro stakes players have. They either bluff at too many rivers or check and/or call with everything but the nuts. Both are bad (too much bluffing is worse at micros) and cost you money. There are definitely hands when betting the river with even TPTK is dumb and others were you can bet TPNK with confidence. Learning to spot the difference between the 2 (hand reading, board textures, opponent type/actions/reads) will make you a lot of money.
Yup, and the lower the micro stakes, the wider the range of possible opponent actions and reactions. By that I mean top pair w/decent kicker may be slightly ahead of some opponents but way ahead of others, and both may call a small bet, or both may call a big bet. On the other hand against other players you may be almost always behind.
And as for the bluffing part of the "tip" that you read, be careful trying to use that without reads. The lower the stakes, the more likely they'll still call with bottom pair. I think the lower the stakes the more it's opponent dependent than board dependent because fewer opponents know how to read boards or can read what you are representing.
