I just want to know what is the most logical next step after finishing the book Introduction to Modern Cosmology by Liddle? Some of the books that Liddle cited are Advanced undergraduate: Introduction to Cosmology by Matt Roos Gravitation and Cosmology by Steven Weinberg (Undergrad!?) Postgraduate: Principles of Physical Cosmology by P. J. E. Peebles Cosmological Physics by J. A. Peacock (Many bad reviews) Modern Cosmology by S. Dodelson Physical Foundations of Cosmology by V. Mukhanov I have also read the book by Roos but I knida dislike it because I feel like there is poor organization of the materials and I found some errors but I can't find any errata so I can't completely trust his book. As for Mukhanov's book, I feel as though it requires QFT as background (I haven't taken QFT yet)? Can anyone advise me on this matter?