Heading tags are very important to get your webpage indexed quickly. Because whenever a crawler comes to our webpage, it starts crawling our article with H1 tag. And due to the proper heading, it can easily crawl our webpage.
If we do not use the heading tag and instead do the formatting of our heading, meaning we increase the font of the heading, make it bold. So in such a situation, a reader will easily recognize what is our heading and what are the rest of the headings.
But search engine bots do not recognize this, without the heading tag, they will take our entire webpage as one paragraph. And he will find it very difficult to crawl our webpage. Due to which our webpage will take time to be indexed.