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User-agent: * Disallow: /blog-links/ Will prevent spiders from crawling/indexing content that is located within that specific subfolder. If your articles are not located within that folder, then they should not be blocked. Maybe check for for meta noindex tags on the actual articles? You should also keep an eye on the "Blocked URLs" page in GWT to see if there are pages being blocked that shouldn't be.

For the most part, tags in blog only have value in that they group together posts on similar topics. You should try to stay away from giving any post a one-off tag where they wind up being the only post ever to sit on that tag archive page. Because your site shows full articles instead of snippets, a blog post and any one-off tag archive page it appears on would be duplicates of each other. Other tag archives with varied posts would not be straight duplicates of any specific post. Normally people NoIndex their tag archives to avoid duplicate content issues.

I don't know Hubspot that well because all my blogging experience is with Wordpress... I'd assume Hubspot may have a way in the backend similar to Wordpress to change the page layout to snippets instead of the full article (which should cut down on the long scroll, lessen dupe content issues & excessive links) and a way to change the amount of articles to show on one page. Hopefully someone with more Hubspot experience chimes in but while you're waiting I'd double check any layout options you have the ability to tweak to see if those could help you.

It looks like there is a giant javascript form ( <form <="" span="">name="Form") on the page that is likely generating all those nonsense URLs. You're not actually linking to them with HTML anchors, but Google and other crawlers can still detect them.</form>

Looks like you missed "http://" in some URLs so the browser is treating them as relative links.  There are more. On this page: http://www.boxtheorygold.com/blog/?Tag=Business+Leader and others like it, I found several URLs that start with "www." which is your problem.  This page has a relative link on the anchor text "keep on improving"