DNS problems from router

There's internet access however when I click a link from a google search I get an err_not resolved same thing on my android and iPhone, I can watch youtube videos but have problems but can't watch instagram videos, I then changed my IP address with a VPN program, everything went well.
How to fix this without using VPN.

Added (1). Thanks in advance.

Use a Public/Global DNS in your Router… Then all computers connected to it will use it as their default.

log into router and use Google or another companies DNS

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