H1 and H2 Tags

Hello, I have a question on individual posts and how the H1's are set up. I want to make sure I am using my H1's, H'2s, etc. properly for SEO purposes. Is the post title automatically set as an H1 tag? If so, I would assume I'd want to start with H2's when I actually get to the body of the post, rather than starting with H1's. Thanks in advance for the help!