The theses dealt with various areas, the Bolshevik attitude to the democracy and called for workers control of the state through the system of soviets.
In the theses Lenin also argued that the time had come for the Bolsheviks to consider changing their name to disassociate them from mainstream European social-democracy as he felt this term was devalued by many leading social-democrats supporting their respective country's participation in the war. This was an argument he first developed in his 1915 pamphlet Socialism and War where he called the pro-war social-democrats Social_Chauvinists.
Much of the arguments laid out by Lenin in his theses were aimed directly at the Bolsheviks themselves as much as the wider population. After the events of the February revolution returning Bolshevik leaders from exile such as Josef Stalin and Lev Kamenev were arguing a much more moderate line, that Russian involvement in the war could be justified and that there should be co-operation with the liberals. However, Lenin's arguments reflected those made by the leading Bolsheviks in Petrograd at the time of the February events, such as Alexander Shlyapnikov.
Lenin succeeded in persuading the Bolsheviks of his arguments as laid out in the April Theses and they provided much of the ideological groundwork for the events leading up to their ascendency to power in the October Revolution.