Integrating pop-ups with your website and aligning them with your goals while respecting visitor preferences are important aspects to consider when implementing your pop-ups. Timing, frequency, targeting, and testing are all important factors to consider. Timing refers to when the pop-up appears on your website. Frequency is how often it appears. Targeting is who it appears to on your website. Testing is how you measure and improve performance. Generally, you want to avoid showing the pop-up too soon or too late, too often or too rarely, and to the wrong people. You can use tools like Google Analytics or Facebook Pixel to create and track segments, and tools like Google Optimize or Optimizely to run A/B tests or multivariate tests on your pop-ups. By testing different elements such as headlines, copy, images, call to action, timing, frequency or targeting you can compare the results and see what works best for your conversion rate.