Question about Orange Book

I heared that is a great book for learning about shaders in OpenGL but I have also heared that the examples in the book are old in comparison to version 330 core+.

It still worth buying it? (lack of resources, so I want to be sure)

I thought so. But it depends on your resources and what you want to get out of it. If you’re just starting out, yes definitely. If you want specifically to learn about the features added since GLSL 1.4 (1.5, 3.3, 4.0), and are already a guru at GLSL 1.4 and shading in general, then no.