Basic edits

docs/guide/concept-components.md

 Components
 ==========
 
-Components are the main building blocks in Yii applications. Components are instances of [[yii\base\Component]]
-or it child class. They support features such as [properties](concept-properties.md), [events](concept-events.md) and
-[behaviors](concept-behaviors.md), which makes them more customizable and easier to use. For example, you may use
-the included [[yii\jui\DatePicker|date picker widget]], a user interface component, in a [view](structure-view.md)
+Components are the main building blocks of Yii applications. Components are instances of [[yii\base\Component]]
+or an extended class. The three main features that components provide to other classes are:
+
+* [Properties](concept-properties.md)
+* [Events](concept-events.md)
+* [Behaviors](concept-behaviors.md),
+ 
+Separately and combined, these features make Yii classes much more customizable and easier to use. For example, the included [[yii\jui\DatePicker|date picker widget]], a user interface component, can be used in a [view](structure-view.md)
 to generate an interactive date picker:
 
 ```php
@@ -19,21 +23,23 @@ echo DatePicker::widget([
 ]);
 ```
 
-While components are very powerful, they are a bit heavier compared to normal objects, due to the fact that
-it takes extra memory and CPU time in order to support [events](concept-events.md) and [behaviors](concept-behaviors.md).
+The widget's properties are easily writable because the class extends [[yii\base\Component]].
+
+While components are very powerful, they are a bit heavier than normal objects, due to the fact that
+it takes extra memory and CPU time to support [events](concept-events.md) and [behaviors](concept-behaviors.md) in particular.
 If your components do not need these two features, you may consider extending your component class from
-[[yii\base\Object]] instead of [[yii\base\Component]], which will make your components as efficient as normal objects,
-but with the extra support for [properties](concept-properties.md).
+[[yii\base\Object]] instead of [[yii\base\Component]]. Doing so will make your components as efficient as normal PHP objects,
+but with the added support for [properties](concept-properties.md).
 
 When extending your class from [[yii\base\Component]] or [[yii\base\Object]], it is recommended that you follow
 these conventions:
 
-- If you override the constructor, specify a `$config` parameter as its *last* parameter and pass this parameter
+- If you override the constructor, specify a `$config` parameter as the constructor's *last* parameter, and then pass this parameter
   to the parent constructor.
-- Call parent constructor at the end of the constructor.
-- If you override the [[yii\base\Object::init()]] method, make sure you call the parent implementation.
+- Always call the parent constructor *at the end* of your overriding constructor.
+- If you override the [[yii\base\Object::init()]] method, make sure you call the parent implementation of `init` *at the beginning* of your `init` method.
 
-For example,
+For example:
 
 ```php
 namespace yii\components\MyClass;
@@ -61,7 +67,7 @@ class MyClass extends Object
 }
 ```
 
-This will make your components [configurable](concept-configurations.md) when they are being created. For example,
+Following these guideliness will make your components [configurable](concept-configurations.md) when they are created. For example:
 
 ```php
 $component = new MyClass(1, 2, ['prop1' => 3, 'prop2' => 4]);
@@ -73,17 +79,16 @@ $component = \Yii::createObject([
 ], [1, 2]);
 ```
 
-> Info: While the call of [[Yii::createObject()]] looks more complicated, it is more powerful due to
+> Info: While the approach of calling [[Yii::createObject()]] looks more complicated, it is more powerful due to
   the fact that it is implemented on top of a [dependency injection container](concept-di-container.md).
   
 
 The [[yii\base\Object]] class enforces the following object lifecycle:
 
-1. Pre-initialization within constructor. You can set default property values here.
-2. Configuring object with `$config`. The configuration may overwrite the default values set above.
-3. Post-initialization within [[yii\base\Object::init()|init()]]. You may override this method
-   and do sanity check and normalization of the properties.
+1. Pre-initialization within the constructor. You can set default property values here.
+2. Object configuration via `$config`. The configuration may overwrite the default values set within the constructor.
+3. Post-initialization within [[yii\base\Object::init()|init()]]. You may override this method to perform sanity checks and normalization of the properties.
 4. Object method calls.
 
-The first three steps all happen within the object constructor. This means, once you get an object instance,
-it has already been initialized to a proper state that you can work on.
+The first three steps all happen within the object's constructor. This means that once you get an object instance,
+it has already been initialized to a proper state that you can reliably work with.