WordPress, CSS and SEO

I need to find and fix the following CSS errors on my site...

https://validator.w3.org/nu/?doc=http%3A%2F%2Fwww.fortressharvard.com%2F

but am not sure where to begin.

I do have an Admin log-in and am curious how and where to make these fixes. I will do a push to BitBucket before I do any experimentation...

I was told it would take 6-8 hours to complete, and suspect that removing things flagged as unnecessary may not be as simple as it sounds.
newbiewebSr. Software EngineerAsked:
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Randy DownsOWNERCommented:
Errors impact SEO if the bots can't index the website properly.  These warnings unlikely to have any effect on Google.

If Google can read it – it will rank it. Google was built to understand websites with low-quality code, and it’s got a lot better over the years. I have never observed a site that was inaccessible run into major ranking problems that weren’t probably caused by other more important quality factors.
While there are benefits, Google doesn’t really care if your page is valid HTML and valid CSS. This is clear – check any top ten results in Google and you will probably see that most contain invalid HTML or CSS. I
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Randy DownsOWNERCommented:
Those are only warnings so not that big a deal for a CMS site but you can use something like this to cleanup the tags if you are really worried about them.

It cost $24 but that's a steal if you save yourself all that time.

Clean up output of <script> tags, remove unnecessary type='text=javascript'

You could also disable plugins to see what is throwing the errors.
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newbiewebSr. Software EngineerAuthor Commented:
I am told these warnings impact SEO. True? How does that happen?
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newbiewebSr. Software EngineerAuthor Commented:
thanks
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