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Voting for a lot of posts depletes your voting power, it recovers back after time. When your voting power gets lower your vote worth gets reduced and if it was originally low (like it is for new users that just started) it is best not to go voting too much expecting to earn rewards for doing so. There is no difference voting for comments or posts, both take voting power and both can bring curation rewards...

"no difference voting for comments or posts, both take voting power and both can bring curation rewards..."

gotcha..
Thanks

Thank You @cryptos for your insights... I just joined Steemit yesterday and
I just followed You.

Thanks again !!