Title and h1 tag

Hi,
I’ve been thinking about some doubts that I’ve always had about the title and the h1 tag on nalleto theme.
On the home page, you can not see either the title tags or the h1 tags, but when you tag a title as <h1>, Yoast Seo says you’re using multiple h1 tags … and I’m going crazy with this …
Also, in my CPT, I have hidden the title using css with “display: none”, and it is not displayed, but the Yoast Seo plugin always tells me that I am using too many h1.

Can you help me with this???

Thanks!!