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I have a Joomla site with a WordPress subdomain that I'm wanting to use as a learning center. It's far more simple for new blog editors and publishers to learn that over Joomla. The issue I'm facing is trying to figure out rather having the blog put into the primary domain instead of a subdomain will hurt my ratings at all? Where I got the idea that it may hurt ratings is due to how (from what I understand) search engines will see a subdomain slightly different than the primary domain. Thank you for any help!

I'm wanting to add tool tips to my site as it's intended for non-technical people that are wanting high tech equipment and services. I thought that by adding tool tips, I could clear any confusion they may have about a particular word right there rather then them having to search for what it means. I did some research online and saw that it may hurt SEO ratings but wanted to verify here first before deciding.