basics

to ensure that the fundamental aspects of something are correct from the beginning

to acquire knowledge of the fundamental principles

to return to considering or doing the most important and simple things

to comprehend the fundamental concepts

to return to considering or doing the most important and simple things

to be familiar with the fundamental information

to become highly skilled in the fundamental aspects

to include the most important and fundamental aspects

to not go beyond the fundamental and most important things

to fully understand the fundamental principles of something

to instruct someone in the fundamental principles

to make the fundamental concepts clear to someone

to go over the fundamental concepts again

to learn the fundamental skills informally or quickly

to focus one's attention on the fundamental aspects

to start discussing the most important or simple facts of a situation

to give a summary of the main points