back-to-basics

[ bak-tuh-bey-siks ]
/ ˈbæk təˈbeɪ sɪks /

adjective

stressing simplicity and adherence to fundamental principles: The movement suggests a back-to-basics approach to living for those whose lives have become complicated.
emphasizing or based upon the teaching of such basic subjects as reading, arithmetic, grammar, or history in a traditional way.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019