Suggest the best and most successful strategy for selling options in Nifty/Bank Nifty?

What are the charges and taxes that we are paying while trading?

Recently I sold options in Bank nifty. I tried to square off the positions when the market went against my view. But, the request got rejected and received a message as “margin short fall”. But at the time of exiting ...

Give some suggestions or rules for beginners to follow in intraday trading.