Security concerns on public Wi-Fi access

Security concerns on public Wi-Fi access
I have heard much about how Wi-Fi is not secure. Yet last
week a news report lead me to believe that the problem is
when people log into Wi-Fi networks where the
administrator/company is unknown and unscrupulous as they can
see what you are doing and then steal passwords, credit card
numbers, and so on. The report inferred that a Wi-Fi network
is OK if it is from a trusted source like your known hotel
chain, Borders, or Starbucks where the network manager
wouldn't do that--we assume anyway. Is this true that the
problem comes from is who is running the network or are all
Wi-Fi open networks easily open to hackers and theft? A
follow up question, would a Wi-Fi network from a trusted
source with a simple access password for all (even if given
to a hacker) stop all the problems? And are there actual ways
that one can securely use public Wi-Fi networks without
worries of hackers and possible theft of personal
information?

Any help appreciated.

I didn't find the right solution from the Internet.

reference:
cnet.co/2FEcQO7
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Thanks!