Analytics helps you understand website and campaign performance so you can make decisions based on evidence. Every other strategy becomes more valuable when you can see which channels produce meaningful results.
Why it matters
Without measurement, you cannot know which channels are producing results, and your budget may be wasted on activity that only appears to work.
Where to start
Set up basic website analytics and conversion tracking before spending seriously on marketing. Review the data regularly and improve one clear part of the customer journey at a time.