Many universities provide legal digital access to the Dover edition via their library systems.

Absolutely. While modern many-body physics now includes topics like topological insulators and advanced tensor networks, the and diagrammatic expansions taught by Fetter and Walecka are the prerequisite "alphabet" for these advanced topics.

Modern "new" iterations of the course often come with updated problem sets or computational appendices provided by university professors (such as Stanford or MIT) to modernize the classic techniques. Is it Still Relevant in 2024?

The book applies these theories to diverse systems, including electron gases, liquid helium, and nuclear matter. Seeking a "New" Edition or PDF?

A comprehensive introduction to the formal language used to describe systems of identical particles.