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I have a site that has 2,50,000 pages and I want to redirect to another domain. Is it good practice for SEO and google?

Hi everyone,
I have one issue about canonical. kindly guide me about it. I have a site example.com/abc and I convert it on an amp and know its URLs is example.com/abc=?amp. but the search console tells me to add the proper canonical URL but both pages are the same. kindly guide me about it. what will I do?

If i add a keyword in my domain so it will help me or not in search ranking.

I am very confused about domain age. I read many articles about domain age, some experts say domain age does matter in ranking and some experts say it doesn't matter in the ranking. Kindly guide me about domain age.