SEO Help

Being very new to Xenforo which i love BTW and the way i have my site installed i would like to know what is the best way to accomplish or improve for SEO. Here is my setup.

Main page is a landing page in the public root public_html. My XF files are under a sub called forum so it is public_html/forum and i also have xenportal and xen media gallery installed.

My question is do i need to add anything to my root htaccess to help aid with SEO. I also worry about security but one step at a time while i learn. Any help or tips would be very appreciated friends.

I have read SEO is not as important as content and i am adding every day and tagging everything i can as well, cannot hurt right ?

Thanks in advance for any help given.