Part 1.
Global Analyses of Neutrino Oscillation Experiments
Neutrino oscillation experiments include those from the Sun, from the atmosphere, reactor long baseline (KamLand), reactor medium baseline (Daya-Bay, Reno, D-Choose), accelerator long baseline (Minos, NOvA, T2K).

Despite a lot of research and better results on neutrinos, many things about them remain intrinsically unknowable. What is known is the rate at which neutrinos of the three flavours (electron, muon and tau) change into one another and the square of the mass differences. What remains unknown is the mass of the electron neutrino, whether it is lighter or heavier than neutrinos of other flavours (one can guess lighter, but that is just a guess), whether neutrinos are or are not Majorana particles (a Majorana particle is its own antiparticle, like the photon for example), and whether there is a type of neutrino beyond the three of the standard model (a fourth neutrino has been suggested as an origin of dark matter).

So, what is known now about masses is:
The mass of an electron neutrino is less than 2.2 eV.
If the electron neutrino is Majorana then its mass is less than 0.4 eV.
The mass of a muon neutrino is more (or less) then that of an electron neutrino by 0.0085 eV.
The mass of a tau neutrino is more (or less) than that of a muon neutrino by 0.050 eV.