The SIP method helps you to buy more units when the market is down, which helps in averaging the price.
Both gold and cryptocurrency have their own merits and demerits and it all depends on the sole discretion of an investor where he/she wants to invest
Buyback happens when a company buys its own shares from the market at a premium price for a number of reasons like to increase the value of remaining shares, increase overall holding value or giving less dividend to the market.
Being a sectoral index, the Bank Nifty only represents the banking sector; including the private banks and PSU banks