In graduation level economics we mainly study
1. Microeconomics
2. Macroeconomics
3. Indian economics
4. Development economics
5. International trade
6. Public finance
7. Math eco
8. Stat eco
9. Indian economic  history
Microeconomics mainly deals with behaviour of individual firms and markets n their decisions  in allocation of resources...It deals with the consumtion and production; demand amd supply of the buyers and sellers.
Macroeconomics deals with the large scale factors like the productivity and  GDP of the overall country and how to increase it ...and how the government should regulate the interest rate ..tax rate and subsidies.
Indian Economics  and indian economic history deals with the economic condition of the country and all the plans n decisions taken by the govt to improve the economic situation of the country and states.
Development economics deals with all the models  set up by different econimists worldwide to improve the economic condition of the whole world.
International trade deals with the concepts of  trade...which goods they should trade so that they can benifit from that.
Public finance basically deals with a country's tax rate and subsidy rates that should be assigned in order to help the country progress .
Math eco and stat eco deals with the mathematical explanation of economical  logics and helps to analyse the data and reach a solution.