Stellar mass black holes are essential laboratories for studying the extreme properties of matter and gravity. The spin parameter of a black hole, which describes the degree of its rotational angular momentum, is a crucial parameter that can provide insights into the formation and evolution of these compact objects. The continuum fitting method is a widely used technique to estimate the spin parameters of stellar mass black holes by analyzing their X-ray spectra. In this review, we present a comprehensive analysis of the spin parameter estimations for three well-studied stellar mass black holes, LMC X-1, LMC X-3, and GX 339-4, using data from the XMM-Newton, NICER, and NuSTAR X-ray astronomy missions. We discuss the underlying assumptions, data analysis techniques, and the resulting spin parameter values for LMC X-1 as \(0.99\pm 0.08\) , for LMC X-3 as \(0.24-0.30\) and for GX339-4 as \(0.997-0.998\) with \(T_{in} \sim 0.78-1.02\,\mathrm {keV}\) , \(0.95-1.21\,\mathrm {keV}\) and \(0.26-1.39\,\mathrm {keV}\) , respectively. The implications of these spin measurements for our understanding of black hole formation, accretion, and astrophysics are also discussed.