A To-Do List App helps keep track of tasks and can be built using JavaScript.JavaScript, a language for web interactivity, controls webpage behavior.To-Do List App functionalities include adding, completing, and deleting tasks.Tools needed: HTML for structure, CSS for styling, JavaScript for actions, a web browser.Step-by-step guide involves writing HTML, adding CSS for style, and implementing JavaScript.JavaScript functions like addTask manage task addition, completion, and deletion.Local storage feature added to save tasks even after browser closure.Anecdote of finding a bug while having Tikka popcorn snacks during coding shared.Tips provided: Test code, maintain cleanliness, practice regularly, and learn from errors.Learnings include the importance of JavaScript, building the app, using HTML, CSS, and JS effectively.Conclusion encourages further practice, building more apps, and taking breaks when needed.