Schema.org is it really that good for SEO

Marketing
1

HI guys I read about schema.org so I was wondering is that really the next big thing that will improve websites alot in terms of SEO search engine optimization

Whats your opinion about it?

2

Do you think creating websites using schema.org/ its is a must do nowdays?

3

The blog of schema.org was hosted by blogger(blogspot). Why is that? Is it affiliated with Blogger? Or Googlel? (Sorry for not being informed with it)