Add meta keywords and description

docs/index.rst

@@ -7,7 +7,8 @@ Dependency Injector --- Dependency injection framework for Python
    :keywords: Python,Dependency injection,DI,Inversion of Control,IoC,
               IoC Container,Factory, Singleton, Design Patterns
    :description: Dependency Injector is a dependency injection framework
-                 for Python. It was designed to be unified, developer-friendly 
+                 for Python. It helps to maintain you application structure.
+                 It was designed to be unified, developer-friendly
                  tool that helps to implement dependency injection design 
                  pattern in formal, pretty, Pythonic way. Dependency Injector 
                  provides implementations of such popular design patterns 

docs/introduction/di_in_python.rst

@@ -131,8 +131,10 @@ What's next?
 
 Choose one of the following as a next step:
 
-+ Pass the dependency injection :ref:`flask-tutorial`.
-+ Look at the other dependency injection :ref:`tutorials`.
++ Pass one of the dependency injection tutorials:
+    + :ref:`flask-tutorial`
+    + :ref:`aiohttp-tutorial`
+    + :ref:`asyncio-daemon-tutorial`
 + Know more about the :ref:`providers`.
 + Go to the :ref:`contents`.
 

docs/tutorials/aiohttp.rst

@@ -1,7 +1,15 @@
+.. _aiohttp-tutorial:
+
 Aiohttp tutorial
 ================
 
-.. _aiohttp-tutorial:
+.. meta::
+   :keywords: Python,Aiohttp,Tutorial,Education,Web,API,REST API,Example,DI,Dependency injection,
+              IoC,Inversion of control,Refactoring,Tests,Unit tests,Pytest,py.test,Bootstrap,
+              HTML,CSS
+   :description: This tutorial shows how to build an aiohttp application following the dependency
+                 injection principle. You will create the REST API application, connect to the
+                 Giphy API, cover it with the unit test and make some refactoring.
 
 This tutorial shows how to build an ``aiohttp`` REST API application following the dependency
 injection principle.

docs/tutorials/asyncio-daemon.rst

@@ -1,7 +1,15 @@
+.. _asyncio-daemon-tutorial:
+
 Asyncio daemon tutorial
 =======================
 
-.. _asyncio-daemon-tutorial:
+.. meta::
+   :keywords: Python,asyncio,Daemon,Monitoring,Tutorial,Education,Web,API,REST API,Example,DI,
+              Dependency injection,IoC,Inversion of control,Refactoring,Tests,Unit tests,Pytest,
+              py.test,docker,docker-compose,backend
+   :description: This tutorial shows how to build an asyncio application following the dependency
+                 injection principle. You will create the monitoring daemon, use docker &
+                 docker-compose, cover the daemon with the unit test and make some refactoring.
 
 This tutorial shows how to build an ``asyncio`` daemon following the dependency injection
 principle.

docs/tutorials/flask.rst

@@ -3,7 +3,15 @@
 Flask tutorial
 ==============
 
-This tutorial shows how to build ``Flask`` application following the dependency injection
+.. meta::
+   :keywords: Python,Flask,Tutorial,Education,Web,Example,DI,Dependency injection,IoC,
+              Inversion of control,Refactoring,Tests,Unit tests,Pytest,py.test,Bootstrap,
+              HTML,CSS
+   :description: This tutorial shows how to build a Flask application following the dependency
+                 injection principle. You will create the web application, connect to the Github
+                 API, cover it with unit the test and make some refactoring.
+
+This tutorial shows how to build a ``Flask`` application following the dependency injection
 principle.
 
 Start from the scratch or jump to the section:
@@ -1085,7 +1093,7 @@ Conclusion
 
 We are done.
 
-In this tutorial we've built ``Flask`` application following the dependency injection principle.
+In this tutorial we've built a ``Flask`` application following the dependency injection principle.
 We've used the ``Dependency Injector`` as a dependency injection framework.
 
 The main part of this application is the container. It keeps all the application components and

docs/tutorials/index.rst

@@ -11,6 +11,6 @@ frameworks.
 
     flask
     aiohttp
-    asyncio
+    asyncio-daemon
 
 .. disqus::