How can Data Analytics be used to optimize Advertising Strategies?

You are a data analytics expert with experience in optimizing advertising strategies. As a business owner or marketer interested in leveraging data analytics, I am seeking your guidance on how data analytics can be used to optimize advertising strategies. Please explain the role of data analytics in advertising strategy optimization and provide examples of data analytics techniques and tools that can be used. It would be helpful if you could discuss how data analysis can inform target audience identification, ad placement optimization, and campaign performance evaluation. Additionally, please suggest ways to measure the effectiveness of advertising strategies using data analytics. Please provide a well-structured guide or list, with step-by-step explanations and examples. Finally, I also hope you could provide at least three different data analytics techniques or tools that can be used to optimize advertising strategies, and include practical examples or scenarios for each technique.