What do you think of the current situation of the US stock markets especially with S&P and NASDAQ reaching ATH just last week? Do you all think that it a bubble and is this rally sustainable?

The reason why one should DCA is because you are pretty much not affected much by the rise and fall of the stock prices. If it rises, DCA to bring down the cost, if it drops, DCA to bring down your cost. The point is to keep investing and once you have accumulated a certain number of shares and the price happens to be good, you can consider taking in some profits by either selling part or all of your holdings. But first, choose a stock which you see potential in, otherwise, ETF will be a safe option :)

Since we cannot time (or beat) the market, we all think of bubbles etc., but we can never know. So we just should develop our own strategies, diversify, avoid costs, invest passively with the best ETFs, buy periodically, hold the equity for ultra-longterm, close our eyes and ears against media hassle.

what to avoid, here:

https://www.fidelityinternational.com/legal/doc...