Spanish is the main language spoken here. You often hear español (Spanish), called castellano in Argentina. Since Argentina is a country of immigrants mainly from Italy and Spain, you can hear older Argentines speaking Italian once in a while.
In Argentina, we use Argentine pesos. One key problem Argentines try to navigate is the inflation rate. Argentina is predicted to reach 100% inflation within the year. Inflation is defined as an increase in the prices of goods and services.
You can purchase a water bottle for 300 pesos, which is a little less than one USD (U.S. dollars). The cost for food, if exchanged with U.S. dollars or euros, is usually very inexpensive. For example, to purchase an orange chicken and rice meal, I spent 1800 pesos a month ago and now the current price is 2200 pesos.