Self-study in real algebraic geometry

I would like an introductory book, a pdf or an online course to self-study real algebraic geometry. My background is the most classical one: I've already studied this book and 80% of this book.

Thanks in advance

EDIT1

Of course, if my background is weak, which books should I read before in order to begin to study real algebraic geometry?

EDIT2

I know that real algebraic geometry is a huge area, but as I said above I'm looking for a book to introduce me the basic techniques. For example, Algebraic geometry is a very broad area, but Fulton is a good introduction to this subject, I would like a "fulton of real algebraic geometry" or something like that.

Here are a few options:

Real Algebraic Geometry by Bochnak, Coste and Roy.

This seems to be the standard reference for Real Algebraic Geometry. Most of the chapters(at least the first 5) should be accessible with a bit of work. Later chapters will require a bit more background.

Introduction to the Real Spectrum by P.L. Clark

This gives an overview of some of the ideas behind real algebraic geometry. It starts by defining what ordering of rings are and how they connect to geometry. Moves on something called the real spectrum of a ring together to results related to it.

Introduction to Real Algebra by T.Y. Lam

This is one my favorites intro papers. It is clearly written and presents the material well. It is a bit dated but I like how it treats the Real Spectrum. Might be a bit too advanced, specially if you have never seen scheme theoretic approach to algebraic geometry.

Real Algebraic Sets by M. Coste

Not sure if this is an intro to the subject but it gives a quick overview of semi-algebraic and real algebraic sets and discusses some topological ideas related to it. For example, how in low-dimension we can characterize real algebraic sets.

algorithmic approach:

Introduction to Semi-algebraic geometry by M. Coste.

Semi-algebraic geometry is often used as a synonym for real algebraic geometry. This gives you a quick intro together with some of its computational tools.

Algorithms in Real Algebraic Geometry by Basu, Pollack and Roy

Similar in spirit to the above, but a lot more comprehensive. Contains a lot of the background material. See also a more recent online version for updates and fixes.

Remark:

You might not be find a complete linear path to learning geometry. I am not sure if this is 100% sound advice but just get stuck in. If you then find some material which you haven't encountered you can take a small detour.