W3 Validation

StatusIDPriorityType
Closed28846NormalSierra WP Theme
Profile Reply
jdaugaar Client

I tried the W3 validation service against my site running Sierra WP. Numourous errors and warnings detected. What is the deal with these? Ignore or worth fixing?
https://validator.w3.org/nu/?doc=http%3A%2F%2Fkerneenergi.nu%2F

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