How we can link two Vf pages in salesforce ?

Hello,

Put the below code in the controller action method that is being called on click of command button

public class myControllerExtension {
public myControllerExtension(ApexPages.StandardSetController controller) { }
public PageReference OpenPage() {
PageReference pr = new PageReference('/apex/Your_Second_Page_Name');
pr.setRedirect(true);
return pr;
}
}