Roosevelt's "Three R's" administration programs were put in action in the midst of the Great Depression with the aims of solving the crisis by introducing a series of laws that focused on immediate issues such as mass unemployment; and more large-scale problems like industrial recovery and balancing of the market.
This should serve as a good summary for what each theme standed for along with a few concrete examples:
Relief: Giving away immediate and direct aid to the most empoverished portions of the population who were also unemployed and thus at severe risk (the Federal Emergency Relief Act granted funds for various relief projects).
Recovery: Helping businesses reconstruct in order to create job opportunities, reactivate consumer demand, and restart the flow of the market (the Reforestation Relief Act introduced the Civilian Conservation Corps, for example, adressed an urgent structural problem while giving work to over 200,000 people).
Reform: A long-term re-thinking of how the financial system should work so that future economic crisis could be avoided (the Emergency Banking Relief Act was created to regulate the Banking system ).
Hope this helps!