[SEO] Add structured data

[ilhamwahabi]

• Richer results when searched through search engine
• Help search engine understand purpose of our website

BTW what type we gonna use? I guess at least we should use the "Breadcrumb" one.

[zainfathoni]

Yes, we can start with the Breadcrumb one and refer to wargabantuwarga.com's implementation

Once we implement and deploy it to production, we can preview it with the Rich Results Test.

References:

• https://developers.google.com/search/docs/advanced/structured-data/search-gallery