If you want to understand the performance of any data structure, you need to analyze the common ways our code might interact with the data structure.
Let's remember "RSID" Operations, stands for Read Search Insert Delete
Now, think about, what you can do with the following list (an array):
friendsOfPrashant = ['Rohit', 'Tinkal', 'Sachin']
Can you read the list? Yes
Can you Search on the list? Yes
Can you insert a new element into this list? Yes
Can you delete an element from this list? Yes
Check out What is Array?
Check out Time Complexity?