For those seeking advanced LaTeX formatting techniques, several resources are recommended. The LaTeX Companion remains a comprehensive guide, while Knuth's TeXbook provides insights into low-level details like paragraph formatting and custom styles. "TeX for the Impatient" is another valuable resource available for free. While using plain TeX can enhance understanding of the system, it is generally advised for experienced users, as LaTeX commands are more user-friendly and modular. Learning both systems can be time-consuming, and some users find TeX's complexity and semantics challenging. Additionally, "Math Into LaTeX" by George Grätzer is praised for its organization and thorough coverage of topics. For further recommendations and reviews, the TeX Users Group is a useful resource.