Broad interest in quantum spin liquid (QSL) phases was triggered by the notion that they can be viewed as insulating phases with preexisting electron-pairs, such that upon light doping they might automatically yield superconductivity and other exotic phases. Yet despite intense efforts, definitive evidence is largely lacking. In this talk, I will discuss recent density-matrix renormalization group studies of lightly doped QSLs in several systems. The numerical evidence of topological superconductivity, striped pair density wave and holon Wigner crystal raised from doping varies types of QSLs will be discussed.?