This book is recommended for its comprehensive coverage of categorical homotopy theory. It is considered a more advanced option but highly regarded for its depth.
The book is often suggested for those looking to delve deeper into categorical homotopy theory. It is seen as a more advanced text, suitable for readers who already have a basic understanding of the subject. The depth of coverage and the focus on examples are particularly appreciated. Some readers note that it can be challenging, but the insights gained are well worth the effort.
Quick quotes
For categorical homotopy theory there's Riehl.
A more advanced option along these is infinity categories, Lurie's Higher Topos theory.
It's not an especially gentle introduction.