Evaluate some of johnson's central critical principles in "preface to Shakespeare"?plz answer in detail

Preface to Shakespeare is an enlightening essay about drama, human
nature, common sense, and literary precepts.

The principles of the
Preface are:

Shakespeare is the foremost of English
writers.

Shakespeare’s characters are
universal.

Shakespeare’s work transcends
genre.

Shakespeare’s plays follow miscuit utile
dulce

Shakespeare polished a crude form.  “He found the
English stage in a state of the utmost rudeness.”

Johnson’s Preface
echoes neo-classical sentiments, especially in his application of mimetic values, and in
his axiom that “nothing can please many, and please long, but just representations of
human nature.”  Johnson also states that “it is always a writer’s duty to make the world
better, and justice is a virtue independent on time or place.”  The Preface is a great
example of ways in which a critic can bring an old author into contemporary
relevance.