understanding attribute routing in MVC4 ASP

attrrouting.cs

[RoutePrefix("home")]
[Route("{action=index}")] //this would assign the default action from the controller
public class HomeController:Controller
{
  //here despite not giving route attribute the controller woudl still pick up this action as the default
  public ActionResult Default(){
    
  }
  [Route("users")]
  //route /home/users
  public ActionResult GetUsers(){
    //you can very well do what you want from here, but see the route mapping on the top
    
  }
  [Route("users/{id:int}/skills")]
  //route : /home/users/1/skills
  //..see how the user can be singled out and then skills are obtained.
  //this becomes a bit of trouble in conventional routing
  public ActionResult GetSkillsOfUser(id){
    /*this woudl find the user first with the id given , observe that the id in the url template and the id in the parameter is the same*/
    //once the user is furbuished we can then proceed to the skills of the user
  }
   [Route("users/{id:int}/skills/{like:alpha}")]
  //route : /home/users/1/skills/Net
  public ActionResult GetLikelySkillsOfUser(id, like){
    //this is capable of getting not only the user by the id but also the likely skills of the user from the phrase to be searched
  }
  //and this is how you get to have optional params in the url
  [Route("skills/{top:int?}")]
  public ActionResult GetTopSkills(top=10){
    //you can get all those skills from here , if the value for the top is not specified then 10 skills would be returned
  }
  [Route("~/categories")]
  //this is the escaping route which does not want to be under /home location
  //route : /categories
  public ActionResult GetCategories(){
    //here we can get the categories from the data base but one needs to see the route under which it is mapped
    
  } 
}