Please explain that would be nice , I am new to coding . Thank you so much

Exercise 1 [Using Modules] Create a new file called T4.py. All functions in the remainder of this tutorial will be added to this file. You should import the helper module in this file to help with your new functions. Using the vowel_check() function, from the helper module, write a new function called count_vowels (s), which takes a string s as input and returns the number of vowels in it. For example, count_vowels ("kitten") will return 2, and count_vowels ("cbc-2") will return 0. Your function should call the vowel_check() function from the helper module.. Test your function. Create a main() function and add a main guard to your program. Your main function should test your count_vowels() function. Be sure that it works for both upper and lowercase vowels