What is the most commonly used letter in English?

Book I am currently reading:
ALMANAC 2020
Ideas/ notes/ quotes from the book
The most commonly used letters in the English language are
E, T, A and O.
This is the book: https://amzn.to/2WZ8sDR
Song I've been listening to:
Big Sean - Blessings ft. Drake, Kanye West
https://www.youtube.com/watch?v=M6t47RI4bns
Sending...
Lots of love,
Subash Limbu