Work with legacy and simple sites using jQuery selectors, events, AJAX, effects, and plugins.
Lessons
Validate fields and show inline error messages.
Form Validation is easiest to learn by reading the example, changing it, and observing the result.
$('#title').text('Plain text content'); // escapes HTML
$('#body').html('<strong>Bold</strong>'); // sets markup
const name = $('#name').val(); // read input value
$('#name').val('Default name'); // set input valuePractice the Form Validation example in a small scratch file, then explain what changed and why.