we can access the elements of a list by using the index from the list. index is basically location where the
elements store
e.g: to access the number 3 from the above variable num is n[2] here we are using index 2 because in list
the index numbers starts from 0 and increments by 1 from left to right.
    We can even access data from right to left as well by using the negative index where the index will starts
from -1. We can get the result 3 by using num[-1]

We can get the group of values by slicing the list, and also we can get the group of words by slicing the list like below

suppose we have a list with couple of letters

str = ['h','e','l','l','o','w','o','r','l','d']

we can get the first 5 letters from the above list by using the str[0:4]  ===> ['h','e','l','l','o']
and we can also use the negative index i.e we can get the values from the right side.

python provides different methods to add the elements to the list, where we can use this by add elements to the list

append()
    By using the append() method we can add the element at the end of the list
    e.g:  test = [1,2,3,4]
        
    we can add the number 5 to the list by using the append method like
            test.append(5)
    
    output: [1,2,3,4,5]

extend()
    By using the extend() method we can add all the elements of one list to another
    But the elements will be added at the end of initial list
    e.g: even_numbers = [2,4,6,8]
         odd_numbers = [1,3,5,7]
         whole_numbers = even_number.extend(odd_numbers)
    output:
        [2,4,6,8,1,3,5,7]

As we know python lists are mutable so we can change the values of the list by using the index and replace with other items.

e.g: fruits = ['apple','banana','grapes']

here we want to replace the banana fruit with melon like below
    fruits[1] = 'melon'

finally when we print the fruits we get the below values
    output: fruits = ['apple','melon','grapes']

del()
By using the del() method we can delete one or more elements from the list. 
e.g: fruits = ['apple','banana','grapes']
    to delete the banana fruit we can use the index like below
    del fruits[1]
    the result of the above statement gives the belo list
    ['apple','grapes']

    We can also delete the multiple elements from the list
e.g: fruits = ['apple','banana','grapes','berries']
    del fruits[2:3]
    the result list will be ['apple','banana']


remove()
Unline the del() method where we delete the element from the list by using the index, here we use the actual element to 
delete from the list.
e.g: fruits = ['apple','banana','grapes']
    fruits.remove('banana')
the result list will be ==> ['apple','grapes']