https://www.oodlesmarketing.com/blog/improve-ppc-ads-performance

For maximum return on your paid media campaigns, you need to have a clear strategy and implement your efforts in the right direction. The success of your PPC ads depends largely on internal factors. Plan, revise, analyze, and repeat. With a good strategy, your paid ad campaigns will become more effective.

https://www.oodlesmarketing.com/blog/improve-ppc-ads-performance-maximize-roi/