What types of ChatGPT prompt that really helped you?

It's great for writing JavaScript! I used it to create a mock data generator using faker.js. I had it write config files that represent ~10 different tables from a standard CRM, then write a function that takes a config file and returns X number of rows based on the configs. Then I built a JS function generator, where you tell it what libraries to use, and what inputs and outputs the function should have, and it returns the JS function, along with a sample input and output. I've also made some fun SVG generators. One generates a snowflake pattern based on a bunch of input variables, and one generates an SVG button with dynamic text/color, and onclick callback. So I can programmatically generate button elements based on input data.