How to Determine the Success or Failure of a Language Learning Experience

I work quite a lot with the content so again with with that we're pulling in various pieces of content from YouTube and TikTok for people to learn with. It's finding those those things that can capture people's interest and that people want to learn regardless of whether they're learning a language or not. I mean basically on retention you like look at the data and say okay people are doing this thing in the app for x amount of time therefore we're meeting our goals is that how that worksBasically yeah largelyYeah retention one other thing we like to think about is time at task we tend we call it in the company which is essentially how much time are people spending actually using or learning the language