Differences Btwn Pgd, Hnd And Bsc. Pls Help!

Hi Dudes,
I will like to know if there is any difference as in job placement level, rating , discrmination and in furthering of education btwn PGD(Post Graduate Diploma) holders, Bsc and HND. Pls will help me to advise someone on the way forward.
Talk about this if you know what is really say.
Thnx