SPF & DKIM records for subdomains

Hi, I have a website and Ive made a docs. subdomain for the website.
the docs. site is completely seperated from the main site.
I added 2 A records to my main site DNS settings with the IP of the subdomain, so my subdoamin site is accessible.
are there any other important records I should add? like my main site has my DNS records including some txt, A, MX records.
Do I need to have similar records for my subdomain to ensure security?
what about SPF & DKIM records?

You only need those records if you are doing email to/from the subdomain separately from the main domain.


Thank you.

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