What happened after the February revolution …

The striking workers and the soldiers formed the Petrograd Soviet and The Tsar was forced to abdicate. The February revolution saw the fall of the monarchy.
After the fall of monarchy a Provincial Government was formed in Russia. Lenin returned from his exile and propagated three points from April thesis i.e. bringing the war to an end, transferring land to the peasants and the nationalization of banks.
The provincial government, headed by Kerenskiii, saw Lenin as a threat and started arresting the Bolsheviks and resisting the spread of their ideas.
Lenin feared Kerinskii’s dictatorship and convinced the Bolsheviks to stage an uprising. He appointed a Military Revolutionary Committee under Leon Trotskii. In October 1917, the Bolsheviks, with the help of Leon Trotskii, seized power from the provincial government.
October 1917, saw the fall of the monarchy, the rise and fall of the Kerenskii government and finally the rise of the Lenin and the Bolsheviks.