jm321

Sherif's answer is very good, as usual.

In view of your unfamiliarity with the subject, I will just add the point that the choice between the two approaches is basically one of relatedness. Since you say that the new websites would be unrelated you would want to stay with the add on domains. Save the use of sub domains for uses that are tied into the main domain.

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Good Success!
James
Douglas County Master Gardeners
"We don't always get what we want, but we always get what we expect."