Dumb SEO Questions

(Entry was posted by Raghul Gandhi on this post in the Dumb SEO Questions community on Facebook, 05/24/2018).

Will sub-domains affect my main domain SEO performance?

Dumb here!
I am having my own business (Graphic Designer) domain.Now I am going to create a sub domain for some charity work of my friend.Is it affect my main domain SEO performance?
Any comments welcome.
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View original question in the Dumb SEO Questions community on Facebook, 05/24/2018).