My goals in this book on Riemannian geometry are essentially the same as those which guided me in my Eigenvalues in Riemannian Geometry [69], to introduce the subject, to coherently present a number of its basic techniques and results with a mind to future work, and to present some of the results that are attractive in their own right. This book differs from Eigenvalues in that it starts at a more basic level,and therefore, it must present a broader view of the ideas from which all the various d