New to SEO. Are there any technical issues on my website that is hurting my SEO?
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There's probably good news and bad news here. The good news is that if the 301 redirects were done properly the 404 errors (or at least most of them) should go away with time. No, they are not necessarily bad for SEO. They are probably worse for your visitors. Have you thought about creating a custom 404 that is more friendly that Google's default 404 page?
The bad news, is that 301 redirects to not pass all of the page rank and page authority. They might pass most, but not all. Because you've changed domains twice already, your site may never recover the lost page rank and page authority. However, if it was a fairly new site (less than a year old for all 3 domains), it might not really matter. If you first domain had good domain age, i.e. it was 10 years old, you probably aren't ever going to recover some of that lost ground.
You may also have another issue with your redirects. Did you do redirects from medtronicdiabetes.net to medtronicdiabetes.com? When you did the new redirects to minimed.com, where did you redirect from? If your redirected the redirects, then that's probably not the best scenario. If you redirect the original URLs (that had been redirected to medtronicdiabetes.com) you will probably be better off.
I am interested to know others' take on this scenario. I have seen sites struggle with this before and it can get quite complicated particularly if the site is large.