Shown in the WP Course for the “Fictional University” theme’s search feature.
REST API Content is spread across four sections, (~5hr):
Section 14: WordPress REST API (AJAX) – 1hr 29min
Section 15: Customizing the REST API – 1hr 6min
Section 16: Combining Front-End & Back-End – 1hr 37min
Section 17: Non-JS Fallback Traditional Search – 39min