Update & Fix Tutorials

[Marcelo Ruiz]

The tutorials are incorrect to the point that is not possible to follow them. Tutorials should be made for inexperienced users, allowing them to follow the tutorial without searching elsewhere to overcome wrong steps. Document writers should follow each step described in all the tutorials to see where additional details are missing.
I am a new user myself, so I don't know how to overcome the errors I find, but I will be happy to point out where the problems exist if I can get in direct contact with the documentation team.