Hi,
You can use h1 tag for any text on your website.
Logo image or any other image already have image tag association therefore h1 tag will not be consider by seo analysis tools.
Use of keywords on image tag is good practice for seo.
I have h1 tag on every page of my website and size of h1 tag is bigger so I manage using style option to make better look as per design of the website.
PrestaShop Tutorials Videos [How to do Tasks]
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