Just bought a PA 22 domain ¿301?
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Just bought a domain PA 22 and DA 16 domain related of my niche, here you can see the authority

What to do?
A) Make a 301 to my money site?
B) Make a mini Blo?
My website is DA 22 and PA 31, will it benefit my site?
thank you :))
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I'm assuming its just the domain.. no website and no current rankings/traffic. Unless you have the resources to manage another blog (loading it up with content, funneling it to your money site), I'd just go for the 301 redirect.
Set up GWT and see which pages have external links to them (via the 404 errors page), then choose appropriate pages on your money site to redirect to.
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Just redirecting an otherwise inactive domain (no website, etc.) will not help the site you redirect it to much at all, even if it has DA / PA. Google reduced how much this tactic helped quite a long time ago. If you bought an active website, transferred its contents to your existing site or created a similar-topic area on your existing site, and redirected pages to their most relevant resource on your existing site, you should see some benefit. However, just buying and redirecting domains is highly unlikely to result in your rankings improving.