With this tutorial, you can easily get a valid, free (fully legal) card.
This is not a good tutorial, and it's not like training how to install different software for a few days.
With this fully assured training, you can easily get a variety of cards for free from the one you think.
Some Cards Cards:
Google Play Card for Google Play and Google Play Policies
Amazon card for shopping from the famous Amazon site
Paypal card for online shopping from abroad, like ...
ITunes Card Cards to Purchase iPhone Money Apps
Set up a PlayStation 4 card to buy PlayStation games
Xbox One Xbox Xbox Games To Buy Xbox One Games
And many other card types from $ 1 to $ 100
You can easily sell and win the cards that you get with this method. (This is a completely legal procedure)