How to trade in share market?

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.

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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