Arduino IDE

Question

I have the Arduino Software, so I want to know some functions.

Answer 1

Basic functions

------ I/O ---------------

digitalWrite(pin , state)
digitalRead(pin )

analogWrite(pin , state)
analogRead(pin )

----------Serial --------

Serial.begin(baudrate)
Serial.print("string")
Serial.println("string")

Answer 2

Why don't you go directly to the Arduino website and start reading the documentation.
https://www.arduino.cc/en/Guide/HomePage
There is no specific Arduino course on SoloLearn.