This document discusses lessons learned from open data initiatives. It argues that open data should be non-partisan and aims to increase transparency, accountability, and participation. Open data needs a steady stream of successes, to scale up, and to include high-value datasets that matter to people. A balanced open data ecosystem is needed with business, research, government, and technical components. While open data enables benefits, it also faces challenges regarding infrastructure, quality, security, and measuring impact. The document advocates keeping open data principles at the forefront.