Task function in program

Hello
I was reading document , there was topic Task function with part of program. its related to RTOS program.

Code:

int main ( void )
{
vInitSystem();// Initialization of peripherals
while(1) // Infinitive function calling loop
{
vTask1(); // Calling task function named vTask1
vTask2(); // Calling task function named vTask2
vTask3(); // Calling task function named vTask3
}
}

. generally we connect microcontroller with different types of devices (LED, LCD, Keypad, button , switch, Motor ..etc) For specific purpose. there are different type of task such as turn on LED, turn off LED, wait , Run Motor, display message..etc there are three task in program that means device is doing three task. I don't understand, which type of task's it may be ?
can anyone explain with example

 

I have only two doubt
type 1. do we create task in program for only one device ?
Task1 turn ON LED
Task2 delay
Task3 Turn Off LED
Type 2 do we create task in program for multiple devices ?
task 1 Turn on LED
Task 2 turn On Motor
Task 3 display message on LCD

 

I have downloaded book and pdfs I am studying documents . it has been long time searching but still have many doubts. Can you give me some simple assignment or task for further research just for learning

 

Thanks for your effort and time. I am not asking for any material. it will be fine for me if you can tell me with specific device (LED or LCD) as you told me in your previous post
whats the requirement ?
which device is connected with microcontroler ?
how many task we are going to do ?
what will priority of task ?
all of answers I am looking in simple example. I have downloaded some sample code. but its more difficult to understand. if possible can you explain all things in single example..

 

sorry for taking so much time. if you look at my first post I tried to explain with example. I am not asking answers. I am asking only idea. suppose you have only Microcontroller , LED and LCD. and you have connected LCD and LED to Microcontroller. what could you do with these devices using RTOS program. I am asking at least five task. what you can make using RTOS program that may be benefit for someone. I am asking example of task that you can do with these devices.