Hello,
Your question lacks information as in for what you want to do registration. But if you are asking in context of competitive exams or colleges, so you must always use the official site. For example if you want to register yourself for admission in Delhi University, you must use their official link, instead of links provided by other sites.
I hope it was useful.
The college campus is good and clean. The classroom is very clean and the canteen is hygiene and serves good food. The seminar hall is very big. The building is well maintained. The wifi facility is available in the campus.