Note on Title Case: Capitalization of Titles, Headings, and Headlines via https://editorsmanual.com/neha-karve

Capitalize the first, last, and all major words in a book title, headline, or first-level heading.

FROM:

https://editorsmanual.com/neha-karve

Title Case: Capitalization of Titles, Headings, and Headlines

Source

And ‘major’ means: no articles, no prepositions (except if >3 letters), and no conjunctions.