This article introduces a handbook on international climate finance, which focuses on money flowing from rich to developing countries to tackle climate change. It looks back on past approaches, such as the Green Climate Fund, and analyzes challenges faced. The experts in the handbook discuss strategies used by nations like Switzerland and Rwanda. They also explore how different groups, like the private sector, can play a role in climate finance. Overall, the handbook aims to help us learn from the past to make better choices in the future to combat climate change effectively.