This tutorial will teach you how to add two numbers using Spring Boot. First Step Select the Template folder.Inside the template folder create index.html page. index.html <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>Insert title here</title> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" > </head> <body> <div class="container"> <div class="row"> <div> <h1>Add Two Numbers</h1> </div> <form th:action="@{addtion}" th:object="${addtion}" method="post"> <div> <label>Num1</label> <input type="text" id="num1" class="form-control" …