Excuse the basic question. I host my domain and website on Squarespace. I use a specific theme and after doing a site crawl of my site Moz picked up that Pages and Blog posts 'Missing or Invalid H1' tags (450 issues!). I discovered that my Squarespace theme only using H2 tags.
Is this a serious issue that affects my search visibility? What would you recommend that I do to fix this, if anything? I'm starting some SEO and lnikbuilding, but wanted to see if this is an issue that I need to consider.
Thanks!!!!