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I wish to learn stability theory, but I don't know what in stability theory (and possibly related areas) from which source.

I've been reading Pillay's Introduction to Stability Theory just because my friends were reading it, but I struggle to read that book.

I'd like a book that gives motivations and/or big pictures, i.e., a book with nontrivial amount of prose.
Marcija and Tofollori's book seems good in this regard, but its exposition is focused on $\omega$-stability only (which might or might not be OK with me for now). I don't know anybody recommending that book, either.

I'd like a book with few errors or at least with a public list of errors, since I feel greatly frustrated and unmotivated by errors. Tent and Ziegler's book satisfies this criterion. It makes an interesting choice of explaining simplicity first. I am not sure if studying simplicity first is good for me.

What do people recommend to a student trying to study stability theory?

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There is no book on stability theory that I would really recommend to students (especially for self-study). Ziegler, for instance, is not famous for his didactic abilities .... Moreover, think a beginner would profit from concentrating on stability (or nip) and postpone the study of simplicity.

Pierre Simon guide to nip theories is modern and a well-written introduction to nip theories (which can also help to understand stability).

Artem Chernicov's notes are mainly taken from Tent and Ziegler's book but here and there he adds some interesting insight.

The good old book of Poizat has a maverick style, but really makes some effort to explain ideas.

EDIT. I forgot to say that, before even think of adventuring into stability theory, you should be very confident with basic model theory. I.e., compactness/saturation arguments, back-and-forth, imaginaries, etc.

Advanced texts are often lazy when it comes to introducing the basics (often they simply rewrite the 60yrs old book of Chang&Keisler). So you are better off with more introductory texts

Very basic texts:

Good old fashioned model theory

Fundamentals of Model Theory

An intermediate text:

A crèche course in model theory

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