Hadamard spaces, Symmetric space, Lattices and locally symmetric manifolds, Arithmetic groups, The Margulis Lemma, Thick-Thin decomposition, Good coverings and the nerve Lemma, Triangulations and simplicial approximations of manifolds, Finiteness statements, Algebraic asymptotic Invariants, Geometric and topological asymptotic invariants, L_2 invariants, Invariant Random Subgroups, Benjamini Schramm convergence