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What are some of the best resources with learning and teaching other GTM and conversion tracking?

For technical SEO, I tend to utilize the Site Auditor tool from Ravwen Tools. Its great.

Excellent question I have also had issues with. At times, Ive seen random URLs pop up in analytics that are not associated with Google ads.

Yes, you can setup a redirect depending on your CMS. We use DNN and there is a section in the site settings that makes this easily possible...or even design your own 404 page any way you want.

From my experience, it is very difficult / cannot forward a HTTP version to a HTTPS version.

I may have to defer to another SEO Pro about forwarding a lower DA to a higher. My educated guess...it doesnt matter. In Google's eyes its not technically considered a link.

It always amuses me when clients purchase multiple domains and want to forward them with dreams of larger traffic funnels. If a branded URL search isnt happening, traffic wont either. For brand protection, absolutely valuable. But when clients want to dominate the internet, this tactic is a pipe dream.

Yes, analyze the links pointing to that domain and verify there arent many SPAM links.

Also, a link reclamation campaign will most likely be needed for brand mentions, which can be very time consuming.

Depends on the CMS you use. Many CMS's can click a quick button to not index in Google search.

If that isnt an option, do it through a robots.txt file in webmaster tools.