I want to add a forum to my site. Is it best to add as..... mystite.com/forum or forum.mysite.com To make the best of it. If you understand what i mean
Personally I would actually go for the /forum. Definatly if you plan to integrate your forum with your main website.
id do mysite.cohm/forums as then all your directorys on your server are organised. Also to save hassle.
For SEO, I wouldn't name it forum or forums. It is better to put something in the directory name that people would search for. So it would be mysite.com/webmasterforums or webdesignforums.mysite.com