H1 and most meta tags are no longer important for SEO with google. I'll save you the long version of the reason and focus on what IS important (tested) 1) Page title/title tag 2) Keyword in first sentence in content 3) Link to home page with keyword 4) Use a BRANDED keyword- ie not just 'green apples' but 'Johns green apples'. In the old days, you wouldn't rank for green apples with that anchor, but now google is brand happy and loves to rank sites for brand+ keyword. 5) Up to date sitemaps 6) page speed. Make your site as fast as possible. Hope that helps.
H1 tag is very important tag in SEO because 1st heading defines the value of the content present on that page. So keep it short and try to define whole concept of a webpage. It helps Google to index your page properly in the related niche.
H1 tag is most important on-page SEO factors for a website. It tells about your website niche, keywords to Search Engine bot to help in ranking.
As per my experience in the field of SEO. H1 tags are very important to define content heading of the page. H1 is playing a vital role to explain about content meaning in very short. This also help to boost ranking in the search engine of the keywords.
Thinks like a page of the book where the chapters starts with the heading. Similarly, H1 serves as the heading of the webpage and is the most important header tag.