Are these ETFs all that we need for long term buy and hold with very high growth?

I would not say high growth.

To answer your question, yes ETF for the long term are the way to go!

1. Especially if you are not a professional analyst analysing a stock , leave it to the fund managers to do the job to manage the portfolio for you, of course with a fee.

2. Use DCA (dollar cost averaging) method to average out the price of the stock - Watch my youtube video on monthly investment plan! - https://youtu.be/t4Npy3BLm2k

I would not say ETF is a high growth stock. The AVERAGE returns of a mutual fund or ETF that tracks the S&P 500 is roughly 6-7% per annum. ON AVERAGE.

I hope above helps! Do subscribe to my youtube channel : Say Do Invest