Instead of trying find out the scenarios to get practice , you can plan a simple project by yourself . It could be starting a simple crud application or a simple shopping cart application . It can be anything which you might be interested on .You can Start building a small application . Then start adding some additional features like adding a search functionality or allowing users to rate about the product . You can allow users to comment and share to others … etc …
If you can able to create and iterate the objects or arrays , and if you can able to create functions and invoke them , then you can start learning Nodejs .