To really make major improvements in your chess game you need to study a variety of concepts. You have already started by reading this. Reading about games, tactics, strategies, etc. are proven methods of improving your chess game. There are also software programs to visually teach you tactics and multiple web sites with a variety of learning tools.
The important thing is to try and stay interested in learning. Playing chess is great fun. Studying concepts and strategies is not always as fun as playing an actual game against a good opponent. Try to stay interested in your studies by utilizing a learning method that you enjoy. If you enjoy reading, then get some chess books to read through. If you are a more visual learner, then some of the software programs or websites may be more your style.