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You can change all link in one time. Go to wordpress dashboard => Tool => Broken Link and use find and replace.

Read this - https://searchengineland.com/googles-matt-cutts-nofollow-links-wont-hurt-you-unless-you-are-spamming-at-a-huge-scale-171486

Don't worry about this. You need to increase dofollow links.

You are linking with wrong way like this -

www.TwoWayRadiosFor.com

Correct way is - www.TwoWayRadiosFor.com

If this url is hypered auto, you need to handle this.  So when you use in content like this - www.TwoWayRadiosFor.com you need to hypered manually with correct url.

You can remove category description from top and keep in bottom due to Your mobile version doesn't have category description on both position. According first mobile indexing, Google is reading your mobile version at this time.  There is no issue with practice you are looking for the same.

To know more about your query, you need to tell us the name of your website.

You need to do one thing with those 404 pages. Move them as 410 status code. Redirection is not good practice for the same.

You need to use robots.txt for the same. Just write a rule and remove your site from Google.

Rule is -

# rules

User-agent: *

Disallow: /

After this, Remove this meta tag -
name="robots" content="INDEX, FOLLOW"/> OR you can update this meta tag with this -
name="robots" content="NOINDEX, NOFOLLOW"/>

Unable to understand what are you saying.

You need to share your website. If you want to show publicly, you can send me as private.

Are you unable to retrieve your site from your server? Is your domain or site hacked?

Don't think so much about this. Use brand name on logo as H1. and you have to be very sure, every page should be have only one h1 tag.

Have you ever listened about EMD Google Algo? And you are following this website - sugarbabieswebsites.

If that links have spam score above 70, then you don't need to disavow. Google is already considered as spam.

3. landscaping.com/landscapers-houston

301 redirection is the best way to handle those sub-domain.

If you think those urls are really low quality, you should use http status code as 410.

Use this  -

You need to check your alternate tags.