Diversification good or bad?

Diversification hides your mistakes.

 

Must for spreading risk. I think diversification is very important.

 

It does.

 

All traders should diversify their portfolio. This is must to reduce the risk involved. One of the major prerequisites to manage money and trades well.

 

"Diversifying over a large number of stocks doesn't mitigate risk. In a bear market all stocks fall. The best way to control risk is to have a method of getting out of stocks in a down market."
Darvas

Look at 2008; diversification didn't help, every thing collapsed.

 

Yes, it definitely is. Every trader needs to diversify his trade well to minimize losses.

 

Works both ways; It also minimizes profits.

 

then trade forex, not stocks
also "buy and hold" is not really a strategy. It's a trade off if you don't know how to trade, because stocks are bullish in nature

 

Buy and hold is a long term trend following strategy with no risk control.

 

Diversifying your funds into different broker can be very good process to avoid falling into the mistakes.