Note that I've used the term "Graphics Programming" rather than just "Computer Graphics".
The RTR book doesn't teach you the programming side of things at all, the material is more theoretical and reads more like a reference book. Most importantly it doesn't have any examples with full source code, so it's not a friendly book to follow for beginners. The PBR book is much better in this regard, but it mainly focuses on offline ray tracing / path tracing which is bit of a distinct topic from conventional real-time rendering on the GPU.
The RTR book doesn't teach you the programming side of things at all, the material is more theoretical and reads more like a reference book. Most importantly it doesn't have any examples with full source code, so it's not a friendly book to follow for beginners. The PBR book is much better in this regard, but it mainly focuses on offline ray tracing / path tracing which is bit of a distinct topic from conventional real-time rendering on the GPU.