Basics of Stock market covers what is a Stock , how its price is determined by Demand-supply .The origin of stock starts in a Primary Market as IPO and then it travels down to Secondary Market(NSE/BSE). SEBI is a regulatory board that governs how a company issues its stocks to public over IPO and other regulations on secondary Markets. Also learnt about Face Value/Dividend/Bonus. Sensex is average of top 30 companies by BSE and Nifty is average of top 50 companies by NSE.