This tutorial is based on the PL/SQL 11g by Oracle Corporation. You can learn basic pl/sql and advanced pl/sql from this app. It is complete PL/SQL tutorial with syntax and example.

You can learn PL/SQL language from this app. Such as-
PL/SQL-Basic Syntax
PL/SQL-Data Types
PL/SQL-Variables
PL/SQL-Constant and Literals
PL/SQL-Operators
PL/SQL-Conditions
PL/SQL-Loops
PL/SQL-Strings
PL/SQL-Arrays
PL/SQL-Procedures
PL/SQL-Functions
PL/SQL-Cursors
PL/SQL-Records
PL/SQL-Exceptions
PL/SQL-Triggers
PL/SQL-Packages
PL/SQL-Collections
PL/SQL-Transactions
PL/SQL-Date and Time