Like when CGP Grey makes a video about the European Union, that video explains everything with details yet clearly and concisely. I thought redux would have been a great word, but it only means "revived"
the essence of a thing in its purest and most concentrated form
you can say:
compendious (adj) compendium (n)
containing the substance of a subject, often an exclusive subject, in a brief form; concise: a compendious history of the world.
marked by brevity and clarity; concise
precis (n, v)
a summary of the essentials of a text; abstract
to shorten by omissions while retaining the basic contents: to abridge a reference book.