Well, a brief resume:~
1918 Germany loses World War 1.
Treaty of Versailles(UK, USA,& France ) imposes VERY harsh financial terms on Germany (repatriation) and causes a severe & longlasting recession in Germany.(the repatriation payments were set to be paid over a long period,and had high terms of interest added too)
The UK & USA,had pleaded for the payments to payable and reasonable,but France wanting a sort of revenge forced the imposition of the highest possible terms (No wonder Germany was so vicious to France in WW2!)
Recession carries on ain the mid 1930's the Germans are basically almost starving,and money is worth nothing.
Example:~
Your weeks salary drops from veing worth �200 to 20p by the time you get from the office to the bakers.
Germans are very angry about the situation, they turn on the Jews who they see as rich and in control of the money (which they aren't)
Rise of Hitler,who says all the things the Germans want to hear.
Hitler invades other countries claiming "Lebensraum" that is Living Room, or expansion for the German peoples,but really to claim the countries and their industries/economies.
The cause of the 1st WW is very complex and I leave it someone else at AB to explain.
Of course the situation in this period is FAR more complex that I have listed,but my facts are a sort of bare skeleton.