FAQ schemas are used for rich snippets that show up as FAQ right below your site listing on google. The schema basically makes your site take up more space in the search listing which increases the likelihood of people clicking on it.
In addition to this, the FAQ schema can also boost SEO rankings and EEAT
My work process
You send me your keyword, and I will analyze the SEO competition for it after which I will write the FAQ.
After I write the FAQ I will create the schema. The FAQ text will be visible on your site and the schema will be visible to google.
According to google's guidelines in order for the FAQ to be eligible for rich snippets the FAQ text must be visible to the user as well, so implementing just the FAQ schema is not enough.
FAQ Schema is excellent for establishing EEAT as most people tend to link to sites that answer question, so you will get backlinks organically.