The theory presented here is able to explain all attributes of cuprate-based High-temperature-Superconductors in the normal- and in the SC-state as well. For the theoretical calculations parameters gained by experiments only are used. It will be shown that all experimental values connecting to HTSC can be predicted/ calculated by assistance of the equation: 1,14This equation is derived from the Hubbard-Model. MPG is the maximum pseudogap, received by extrapolating the pseudogap-values to zero. From that Fundamental-Formula one can get seven quantitative connections between superconduction-attributes and doping, all proved by experiment. Additionally two well-hidden faults in BCS- and McMillan-theories will be shown. Without deleting these mistakes no theory of High-Tc-Superconductivity can be successful. More than 300 experimentally measured values will be compared with the predictions of theory. In more than 90% there is quantitative, otherwise qualitative accordance between experiment and theory. Reluctance is senseless: This theory will succeed.