Every startup needs to know what makes a user stick. Figuring this out helped us make key decisions to grow our business, such as identifying a product adoption indicator that measures the number of core actions users take inside the product that indicate they will build a habit and continue to use it in the long run. The goal is to find a magic number, also known as a product adoption indicator, for your product by analyzing user behavior and retention rates. This involves selecting a core action, setting a table with different numbers of workflows created during the first week, doing math to identify users who create at least that many workflows, filling out a table with percentages of overlap between these groups, and finding the largest overlap number. It's essential to consider time-bound core actions, be ready to adapt as the business grows or changes, and revisit this process every 3 months to ensure the magic number remains accurate.