I've noticed on some tabs they add the corresponding notes such as F# A or Bb, which is fine. What's confusing me is that some are labeled H. I'm far from being a music scholar, but I've never seen an H note. Am I missing something? Does the H mean it's supposed to be a half step bend?

What I've always done when I'm looking at someone's tab and I don't understand their notations is I'll ask them personally via personal message through the website. Most folks are more than willing to explain their tabs.