How to trade in share market?

Hi
I am a teenager and i am now 18 yes old now i am trying to invest in share market,but i am not quite familiar.
Can you explain some general terms used in share market and which shares are gud.
Plz also tell me the difference between shares and mutual fund.

IF POSSIBLE PLZ TELL ALL YOUR KNOWLEDGE ABT SHARES.
I will be greatful to you.
Thnx in advance

Is the chart obtained from NSE India correct ?

When I take the chart of Nifty futures from NSE India, I feel there is some difference comapred to ICICI Direct. For example @ 12:15:13,
the nifty future 25 Jun is 4635. But the ICICI trade screen price is different shoing 4634 Why Such a big difference . IS Time price chart of Nse wrong ? Which is the Authority ?

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