I am new to meteor. I followed the tutorials and successfully making simple interfaces like below. I tried finding examples to add menus/ subtopics like this which does not reload the page when clicked, but I couldn't find any examples. Could you please give me an example how to do this?
in simple-todos.html
<head>
  <title>Todo List</title>
</head>
<body>
  <div class="container">
    <header>
      <h1>Todo List</h1>
    </header>
    <ul>
      {{#each tasks}}
        {{> task}}
      {{/each}}
    </ul>
  </div>
</body>
<template name="task">
  <li>{{text}}</li>
</template>
in simple-todos.js
if (Meteor.isClient) {
  // This code only runs on the client
  Template.body.helpers({
    tasks: [
      { text: "This is task 1" },
      { text: "This is task 2" },
      { text: "This is task 3" }
    ]
  });
}
				
                        
You can achieve it by using IronRouter (Guide) or FlowRouter package.