About H Tags? how many can we use in an article?

Hello all,

So i have a pillar post with lots of subtopics...and i have been using the h3 on each topic. I have like 30 H3 tags - ive use those SEO site analyzers and on the analisys it said that i have to much H3 Tags and that it can be considered Spam

I would like to know how many H tags can we use?

Can someone help me out on this please?

thanks