How should I tackle this situation?

First of all, I’m kinda noob in wp, but I have these theme installed on the website I’m working SKRN – Media Streaming App Template, and I would like to add another theme Education WordPress Theme – Masterstudy but only for one page, more exactly that page which will hold all the video(courses) will be on the website.

Should I be using Masterstudy as a child theme, or what approach should I take?

but only for one page, more exactly that page which will hold all the video(courses) will be on the website.