For programing hello world board I decided to start with the tutorial that is listed on Fabacademy website you can access it by clicking here
First as the tutorial suggests, I had to download ATtiny support in Arduino IDE and for doing that I followed this tutorial as it was suggested by Fab Academy website.
However, After that I had powred my board using a FTDI cable while I was connecting it with the FabISP via the ISP header as shown in image #04.
I connected MISO, MOSI, SCK, RESET, VCC, and GND of the Fabisp to the corresponding pins on the hello world board .
Then, From Arduino IDE boards menu I chose Attiny 24/44/84 and from the processor menu I chose Atiny44 and I chose external 20MZH from the clock menu in addition to that I chose the port that the FabISP is connected to .
Next, I clicked on burn bootloader button and I got this massgae " Done burning bootloader "

However, after that I used the below code and uploaded it to my hello world board ( NOTE : when using FabISP as a programer you should select USBtinyISP as a programer ) And the code was uploaded successfully without any problem.

/*
This code was modified by Georges Hanna Fab Academy 2018, EMBEDDED PROGRAMMING
The code was modified Based on the below codes :

+ controlling  a servo motor by two push buttons
http://www.instructables.com/id/Servo-Controlled-by-Pushbuttons/ //

+ LED Bar Graph
https://www.arduino.cc/en/Tutorial/BarGraph


 Button

 Turns on and off a light emitting diode(LED) connected to digital pin 13,
 when pressing a pushbutton attached to pin 2.

 The circuit:
 - LED attached from pin 13 to ground
 - pushbutton attached to pin 2 from +5V
 - 10K resistor attached to pin 2 from ground

 - Note: on most Arduinos there is already an LED on the board
   attached to pin 13.

 created 2005
 by DojoDave 
 modified 30 Aug 2011
 by Tom Igoe

 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/Button
*/

// constants won't change. They're used here to set pin numbers:

const int buttonPin = 3;     // the number of the pushbutton pin
const int ledPin =  7;      // the number of the LED pin

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
 // initialize the LED pin as an output:
 pinMode(ledPin, OUTPUT);
 // initialize the pushbutton pin as an input:
 pinMode(buttonPin, INPUT);
}

void loop() {
 // read the state of the pushbutton value:
 buttonState = digitalRead(buttonPin);

 // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
 if (buttonState == HIGH) {
   // turn LED on:
   digitalWrite(ledPin, HIGH);
 } else {
   // turn LED off:
   digitalWrite(ledPin, LOW);
 }
}

PROGRAMING HELLO WORLD BOARD ARDUINO