The best thing about blackjack trainer games is that you can have fun while playing your favorite game and receive a great amount of tips and constructive corrections at the same time. Of course you can just play tons of regular games, but you will not learn as much. It is like the difference between trying to get back in shape on your own and working with the personal coach in the fitness club. If you want to learn a new skill you need somebody (or here will be more like something) to guide you.
And the trainer will deliver this just fine. Every time you will make a wrong call, the trainer will explain you what you should have done differently and why. While having your mistakes corrected right away, you will learn faster how to avoid them. Playing such educational free games you have a wonderful chance to test out different strategies. One of the best ones to try is the strategy chart. You can clearly see how it works, because the trainer will commnet each of your calls. Have a great time learning and good luck with the results.