

There is more a singer can do than take singing lessons. There are libraries and websites filled with entire operas, courses, books and information that any singer at the beginning of their career should take advantage of. Here are some examples:
MASTERCLASSES
Royal Opera House masterclasses playlist
(not included in the playlist):
How to sing opera - Angel Blue vocal masterclass (The Royal Opera) (2019)
How to sing opera with Juan Diego Flórez - Royal Opera Masterclass (2019)
How to sing opera with Joyce DiDonato - Royal Opera Masterclass (2019)
Juilliard vocal masterclasses (1971-2019) playlist
includes Maria Callas, Luciano Pavarotti, Renée Fleming, Joyce DiDonato
Wigmore Hall's Thomas Quasthoff Masterclass (2019)
Carnegie Hall's SongStudio 2019: Piotr Beczała Master Class: De Curtis’s "Tu ca nun chiagne"
What makes a great soprano? (Hosted by Kiri Te Kanawa)
Concertgebouw in Amsterdam – Kiri Te Kanawa | IVC Masterclass (2019)
Elisabeth Schwarzkopf.MASTERCLASS.Part 1.EDINBURGH.TV. Introduction film to the Series. (1980)
BBC Cardiff Singer of the World Masterclasses (2019):
Masterclass with Dame Felicity Lott
Masterclass with Dame Kiri Te Kanawa
Masterclass with Frederica von Stade
BOOKS & SCORES
Scores:
G. Schirmer Opera Anthology books (Arias for soprano/mezzo-soprano/tenor/baritone, etc)
[to be continued]
Books:
Opera 101 (2013) by Arthur W. Ritchie
[to be continued]
OTHER
Iconic arias selected by the Royal Opera House
[to be continued]