What are the main issues to learn Codeigniter?

[eluser]luisvallin[/eluser]
What are the main issues to learn Codeigniter?
what are the problems?

[eluser]satie[/eluser]
The main issue is reading documentation http://ellislab.com/codeigniter/user-guide/ and avoid to spam forum

[eluser]luisvallin[/eluser]
okay I will take the suggestion...
My task is to analyze the opinions :/