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+* [`css`](#usage-css)
+* [`addClass`](#usage-addClass) | [`removeClass`](#usage-removeClass) | [`toggleClass`](#usage-toggleClass) | [`hasClass`](#usage-hasClass)
+
+---
+
+## <a id="usage-css"></a>.css
+
+**Description**
+Get the value of a computed style property for the first element in the set of matched elements or set one or more CSS properties for every matched element.
+
+**Parameters**
+
+* `property` (String|Object): A CSS property name or an object of property-value pairs.
+* `value` (String|Number, optional): A value to set for the property.
+
+**Returns**
+
+* (String): The value of the property (if getter).
+* (jBase): Current instance (if setter).
+
+**Example**
+
+```javascript
+// Get value
+const color = $('.box').css('color');
+
+// Set single value
+$('.box').css('width', '500px');
+
+// Set multiple values
+$('.box').css({
+    'background-color': 'blue',
+    'font-size': '14px'
+});
+
+```
+
+---
+
+## <a id="usage-addClass"></a>.addClass
+
+**Description**
+Adds the specified class(es) to each element in the set of matched elements.
+
+**Parameters**
+
+* `className` (String): One or more class names to be added to the class attribute of each matched element.
+
+**Returns**
+
+* (jBase): Current instance.
+
+**Example**
+
+```javascript
+$('p').addClass('lead text-muted');
+
+```
+
+---
+
+## <a id="usage-removeClass"></a>.removeClass
+
+**Description**
+Remove a single class, multiple classes, or all classes from each element in the set of matched elements.
+
+**Parameters**
+
+* `className` (String): One or more class names to be removed.
+
+**Returns**
+
+* (jBase): Current instance.
+
+**Example**
+
+```javascript
+$('.active').removeClass('active');
+
+```
+
+---
+
+## <a id="usage-toggleClass"></a>.toggleClass
+
+**Description**
+Add or remove one or more classes from each element in the set of matched elements, depending on either the class's presence or the value of the state argument.
+
+**Parameters**
+
+* `className` (String): One or more class names to be toggled.
+
+**Returns**
+
+* (jBase): Current instance.
+
+**Example**
+
+```javascript
+$('.btn').click(function() {
+    $(this).toggleClass('btn-active');
+});
+
+```
+
+---
+
+## <a id="usage-hasClass"></a>.hasClass
+
+**Description**
+Determine whether any of the matched elements are assigned the given class.
+
+**Parameters**
+
+* `className` (String): The class name to search for.
+
+**Returns**
+
+* (Boolean): True if the class is present, false otherwise.
+
+**Example**
+
+```javascript
+if ($('#menu').hasClass('open')) {
+    $('#menu').slideUp();
+}
+
+```
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