Best way to extend alfresco

[antonio_lazaro]

Are webscripts the best way to extend Alfresco?
If I'd like to build a project above Alfresco using it services of persistence and management.Can I get?
Or just creating a new module?If yes, how can I developer this things?

[jbarmash]

Web scripts is only one of many extensibility options.  It really depends on what you are trying to do. 

Can you please provide more information?

[antonio_lazaro]

I want to create an aplication to provide the follows features:

* User can define categorys (Hierarchy)
* User put files in categorys
* User can make customizeds searchs;

My aplication will to abstract the mecanisms from Alfresco and offer a friendly UI.
What's the way to get do this?