Help me with these confusing tenses

Hi,

 kindly answer the following confusing question and make us all learn this grammatical rule

In a certain dialogue between two persons, one of them is saying that he saw (past) some other people who are deceptive and think ill of others

what are the tenses I should put the sentence in

" I have noticed there are plenty of people, whose faith is of no use in their social dealings, think ill of others even before communicating with them. "

Thanks in advance

if my inquiry is not clear, I hope you let me know

Thank you so much it was extremly confusing

But the phrase" whose faith is of no use in their social dealings " is parenthetical

The "I have been learning" is okay - it shows that it's still going on right now.

"From every nook and cranny" isn't quite right. It's a perfectly good expression, but it should be used for physical things, unless the walls themselves are whispering to you. Try "from every quarter."

Your "has befallen" is also okay - it brings whatever it is that has happened right up to the present time.

But "after my travel" doesn't work - I'd say use "since my departure" but I don't like two "sinces" in the same sentence. How about "from the time I left"?