Finding diffuclties with project 5

Project 5
I am finding difficulties in the project

It is similar to switching on and off an output device.
In case of switching on : we write digitalWrite(‘HIGH’)
but here we need to change the intensity of output…so we need to write it as analogWrite(‘value’).
here the analog value ranges from 0 to 255.

Project 5 contains many tasks.
Please specify which task is difficult…
Regards