When did the Russian revolution start against Czar and what were the exact reasons with results thereof?
This is beyond the scope of a simple answer, but there were two revolutions, the first in February of 1917 in which tsar Nicholas was overthrown and a Provisional government set up under Kerensky, and a second revolution in October, (or November, depending on which calendar you use) when the Bolsheviks overthrew the provisional goverment and established the Soviet state. Following this was the civil war in which the forces of the Red and White armies fought for control. The Bolsheviks were holding Nicolas and his family and entourage in a house requisitioned from an engineer, Nicholas Ipatev, in Ekaterinburg, and in July, 1918 when White forces threatened to take the town, the Imperial family was ushered to the basement and shot, their bodies carried in a truck into a forest and dumped first into a mine shaft and then reburied in a shallow grave. There are quite a number of books on this subject, and the matter is far too complex and detailed to permit any satisfactory discussion here.
