does anything changed for Q2A , Google throwing so many errors in analytics

Question

getting so many erros in crawling of q2a website, is anything change for q2a?

why the revenue is dropping for q2a websites?

What should be the perfect Robots.txt and htaccess file , please help to post both code if possible?

below is the errors showing in google for me

Comments

Reason    Source

Validation    Trend    Pages
Page with redirect    Website   

Failed
100,557
Blocked by robots.txt    Website   

Failed
28,070
Alternate page with proper canonical tag    Website   

Failed
9,248
Duplicate without user-selected canonical    Website   

Failed
1,581
Not found (404)    Website   

Failed
588
Soft 404    Website   

Failed
461
Excluded by ‘noindex’ tag    Website   

Failed
335
Server error (5xx)    Website   

Failed
13
Crawled - currently not indexed    Google systems   

Failed
75,193
Duplicate, Google chose different canonical than user    Google systems   

Failed
553

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We are not seeing any sudden errors. But we have recently turned off Google ads as it is becoming bad for user experience and revenue from ads is not worth it.

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Those are not errors. Errors are red. That's just informative. You can read the documentation on each item to understand what is going on with them