We present recent results of the global analysis of neutrino oscillation data including LBL data from T2K and NO$\nu$A, SBL results from the reactor experiments Daya Bay and RENO, and the atmospheric neutrino results from Super-Kamiokande have been included in the fit, and discuss how precisely neutrino oscillation parameters are determined.
The current status of determinations of neutrino mass ordering, CP violation and octant of $\theta_{23}$ from the fit by using latest neutrino data are discussed.
We review on the recent developments of the origin of the neutrino mixing pattern, and demonstrate how such a tiny neutrino mass can be generated. Several recent proposals for neutrino mixing patterns and tiny neutrino masses
are introduced.
Recent developments of the impact of non-standard interactions and non-unitarity of neutrino mixing matrix on the results for neutrino oscillations are addressed.