whic investment plan?

Which is the best mutual fund investment in India? What are the factors we have to consider while investing and how should we manage our funds? Which are the giving maximum benefits? Is there any one time investment plans? Which website gives correct information and guides us without hiding the facts? What is best “should we invest in MF” or “NSC” or “PPF” or “TAX saving bank account” or “Post office” for investing 50k ?