H1, H2 Tag are used for Heading Tag in website content and Alt Tag also known as “alt attribute” and “alt description,” is an HTML attribute applied to image tags to provide a text alternative for search engines. Applying images to alt tags such as product photos can positively impact an ecommerce store’s search engine rankings.
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Exactly how search engines like Google calculate things is a closely held secret but we can know that certain things like a good structure and descriptive headings can be helpful. This post gives some good information on the use of the different H tags and their relation to SEO. Alt tags on images are important not just for SEO but also for visually impaired users using screen readers as the alt tags can add context to a page that would otherwise be lost when using a screen reader or other accessibility options.

yes, H1 is with the highest priority but be careful to use only 1 H1 tags per page not more. also its not necessary to have all the tags in your page. mostly h1, h2 & h3 does the all.

more importantly, you should spend most of the time of SEO with related link building. more related industry sites point your site with related info google will higher your rank.

H1 is a heading tag - Page must have one heading tag for SEO
h2 is a sub heading tag - You can use sub heading in your page for making it good for SEO
Alt Tag is Image tag - You can tag images with proper image name top get help in SEO

In HTML, There are totally Six heading elements (such as <H1> to <H6>) available to use in the structuring and optimizing the content for Search Engines crawlers as well as readers. <H1> is a primary element and it is used to identify the title of the content. <h2> will be used for sub-heading. Whereas, Alt tag is used in the <Img> tag, which represents Anchor text of the particular image.

Hello,
H1 tag is considered as the main heading of the blog. The heading which we put in our blog at the top is known as H1 tag. H1 tag should be in such a way that, user need to understand the topic of our blog easily and get attracted to the title.

H2 tag is considered to be very important next after the h1 tag. We will specify different headings or contents of our blog in H2 tag.

Alt tag or Alternative tag is specified to the images we upload in our blog.

This is the main difference between H1, H2 and Alt tags.

you can use <H1> tag for most important tittle in your page and for better seo you should have just one h1 tag but h2 is use for other tittle in your page and you can use more h2 tag but for better seo is better you have less than 10 h2 tag