Acronyms
CTR
CTA
ROI
CAC
LTV
CRM
Definitions
How many people actually clicked your thing. Yes, you're supposed to be tracking this.
How much a customer is worth over their entire relationship with you. Hopefully more than CAC.
The software that tracks all your customer relationships. Or collects dust. Your choice.
Did you make more money than you spent? That's ROI. Spoiler: you should be.
The button or link begging people to do something. 'Buy Now' counts.
How much you're paying to get each new customer. Yes, you're supposed to be tracking this.