This document discusses when and how to shift or optimize media budgets across different marketing channels. It provides tips for marketers on attribution, understanding the customer journey, and evaluating platforms before making budget shifts. The key points are: 1) Marketers should start by understanding attribution across online and offline channels to know which channels are contributing to conversions. 2) They should optimize platforms within channels by reviewing targeting, audiences, bids, creative, and tracking before shifting budgets between channels. 3) Marketers need to consider measurement, diminishing returns, what to shift budgets to/from, and avoid pitfalls like moving budgets too quickly without testing or abandoning platforms prematurely. Planning shifts and remaining flexible is important.