There is an expression common in Australia: “No worries, mate.”
Generally, it means that the situation is under control and can be handled.
There is no person alive who can truly say “no worries.”
We all have things that are legitimate worries, but we also have some that are not reasonable and ought to be dismissed.
See: Psalms 96:2; Matthew 28:19; Acts 1:8; 2 Timothy 4:5