2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148073We present a summary update of the QCD spectral sum rule (QSSR) results for the running and {\it perturbative pole} quark masses, the $f_D$ and $f_B$ leptonic decay constants, the heavy-to-light and heavy-to-heavy exclusive transition-form factors. Analytic expressions of these latter quantities are presented, which give a deeper understanding of their $q^2$- and infinite mass-behaviours. A short comparison of the QSSR results with alternative approaches is done.10 pages on Latex file. published version: minor modifications compared with the previous version. Contribution to the session on non-perturbative methods, EPS conference HEP (July 1995) BrussellsHigh Energy Physics - Phenomenologytext