Any external resources to learn SQL views?

Question

working on a project with PosgreSQL that requires creating views.

Answer 1

Official documentation of PostgreSQL:
https://www.postgresql.org/docs/9.4/static/sql-createview.html

These are also good:
1. http://www.postgresqltutorial.com/postgresql-views/
2. https://w3resource.com/PostgreSQL/postgresql-views.php