Few subjects have a wider gap between their popular presentation and their technical reality than string theory. The trade books make it sound like poetry; the graduate texts demand quantum field theory, general relativity, and advanced mathematics. Reading in order is the only humane way to cross that chasm.
The path that works is to build conceptual intuition with popular science, then a bridge book that starts the real physics gently, then the standard textbooks, and finally the mathematical frontier. Each book below is placed at the right altitude so the climb stays possible.
Build intuition
Start with The Elegant Universe by Brian Greene, the classic popular account that makes the motivations and ideas of string theory vivid without equations. Warped Passages by Lisa Randall extends the picture to extra dimensions and braneworlds with the same accessibility. The Fabric of the Cosmos, also by Greene, deepens your feel for space, time, and the questions string theory tries to answer. These build the conceptual scaffolding the technical books will hang detail on.
Take the first technical steps
The gentlest real bridge is The little book of string theory by Steven Gubser, a genuinely mathematical but compact introduction from a working theorist. When you are ready to commit, A First Course in String Theory by Barton Zwiebach is famous for being the most accessible serious textbook, designed for advanced undergraduates. Because supersymmetry underpins the theory, Supersymmetry demystified by Patrick Labelle fills that essential prerequisite with a patient, worked-example style.
Reach the standard texts and frontier
The graduate core comes next. String Theory and M-Theory: A Modern Introduction by Becker, Becker, and Schwarz is a leading modern textbook covering the full landscape. The two-volume String Theory, Vol. 1 and String Theory, Vol. 2 by Joseph Polchinski are the field's definitive reference, demanding but authoritative. For the mathematically inclined, Quantum Fields And Strings A Course For Mathematicians connects the physics to rigorous mathematics at the deepest level.
Read in this order and string theory stops being either poetry or a wall. Follow the full path to go from wonder at the popular ideas to genuinely working through the theory.
