Google Search Console - Help. Errors & Exclusions

[Mark3347]

Can someone help me figure out what caused all the errors showing up in Google Search Console? I am unable to figure it out and don't know what to do next. I don't want to make it worse.

I recently changed themes (5/9/22) and since then I seem to be having issues with Google Merchant Center and Google Search Console.  Lots of my pages have been excluded for robots.txt issues, conical tags issues and indexing issues.  I don't know if they are related.  All of the errors show under the Coverage tab.  I don't even know where to begin to fix this.  Any suggestions?  Anyone?

TIA

Mark