Hello @pansipansi,
Having an H1 tag and other heading tags on every page is important, and their hierarchy should be followed accordingly.
You can read this link to learn about how to use heading tags on your website: https://developers.google.com/style/headings.
For your information, an SEO plugin is highly recommended; you can search in the wp.org/plugins repository to find a suitable plugin for SEO(like Rank Math, or Yoast SEO plugins).
There are many ways you can add H1 to a page,
For example:
1. Use H1 for the website title.
2. You can add H1 heading anywhere(typically, it’s placed in the first section following the header. However, there are no strict rules regarding its location on the page.) by using blocks/widgets which your page builder provided.
3. Using the “Page Title”, please navigate to the WP Dashboard > Customizer > General Settings > Page Title, and set the main title as H1.
4. Use the OceanWP Settings(Ocean Extra plugin in this case required). Go to the “Page Title” tab and enable it.
Please note that for steps 3 and 4, it is important to read and follow the links provided in this URL: https://docs.oceanwp.org/category/45-page-title.
5. Use proper HTML tag(s) – H1, H2, H3, … in the right spots on your website for good UI. Gutenberg and Elementor have easy to use options for this; you can search for the “HTML” block or widget.
I hope it helps.
Best Regards