In the courses section a Latin Spanisch course is featured: Nativescript with Angular and Firebase by Jorge Cano.
Jorge also offers free how-tos on YouTube in Latin Spanish, which are mentioned below.
Angular 2 & Nativescript (duration 1:07:32)
How to connect Nativescipt to Firebase (duration 17:22)
Nativescript Social Login with Firebase (duration 27:59)