1. Variable : In Javascript, variable can be declared with 3 keywords : var, let, const. There are also some naming convention of variables. 1. Camel Case : firstName, lastName, userName 2. Pascal Case : FirstName, LastName, UserName 3. Snake Case : first_name, last_name, user_name 4. Kebab Case : first-name, last-name, user-name 2. Difference between “==” and “===” : “==”…