Hello @Muhammad_ahsan
You can make custom page and call frappe api from custom page, because to change form layout you need to change core code and after that you will not able to update erpnext.
We used inbuilt frappe library for this, so it will be easily updated.
Dashboard:
Add record using default QuickView.
Report:
For custom website you can refer http://sbknext.com/ (Under development) built using http://frappe.github.io/frappe/user/en/guides/portal-development/