trick is to start using it for whatever usecase you want than later you discover that you can use it for other usecases as well and your previous learning carries over. For eg. use it to write readme and export it to html/pdf/md etc. later if you feel the need of task management system for todo/progress/done well org mode supports that so you don't need to learn altogether new service for tasks. This was my journey as well

need to write and export to different formats--> need for task management system --> need for small excel sheet (org mode tables --> need for http request/response aka postman/insomnia --> continuing

have you read their page? it is really good https://orgmode.org/.