The main feature or main goal of President Obama's policies during his first year in office was to try to improve the economic situation in the United States. While Obama did take other actions during that time, the major goal of his first year was to help pull the US out of the recession that had followed the financial crisis of 2008.
The most important law that President Obama signed during his first term was the American Recovery and Reinvestment Act, better known as the economic stimulus package. This law put hundreds of billions of dollars towards trying to restart the economy. Obama also signed such laws as the "Cash for Clunkers" act and the "Helping Families Save Their Homes" act. Both of these were similarly meant to jumpstart the economy and/or to keep it from slipping further into recession.