For my hobby project World of Wonders I made a complete WebClient where users can listen to the audio from the Minecraft server and can see their live location on the park map. Using the framework React and library LeafletJS it was possible to show markers and areas on the map and to make them responsive on how zoomed in the user is. After an update I managed to create my own TileMapService with this custom map, which optimized the application a lot.
While working on this project I learned a lot about the less basic stuff of JavaScript. For example providers, utils, eventListeners and how to devide different functionalities into independent pieces of code.