Yup, all greek to me too. Ok, I've a question for you know-how guys. Let's say somebody vested 50/50 stocks/bonds in a managed 401k. Wise move right at this moment to rebalance the portfolio to 80/20 stocks favored, and start aggressively contributing to that?
My own opinion - and don't put much weight on it - is the short term future is uncertain but if you have a 10 year horizon before any critical need to use that money, then do it. Riding out the cycles has worked for me.
One comment on strategy from Warren Buffet or somebody was: You can never time the market. But long term its more costly to be out, rather than in. This is because the increases that create superior overall return appear on random days and you miss those if you are out.
I've stayed at least 60~70% stocks (mostly S&P Index fund) through the downturns of 2000 and 2008 because I didn't need the money short term, and believed that the concept above was valid.
Buying today is a 50/50 gamble on the short term - that's what determines today's stock price, today's price is quite simply the balance of today's greed and fear. But long term I expect the US economy to continue to make money and pay dividends so I want to be a participant.
Another theorem: 85% of individual investors underperform the S&P 500. I want to be in the top 15%! So an S&P index fund with the lowest fees is my preferred investment. 'It will fluctuate' but in the long view I think these are the companies so powerful that they create their own opportunities (or buy competitors) while everyone else just tries to compete against them. Back in the late 90's I was newly retired and made some money day-trading in the dot-com boom of then. I felt I understood technology better than some, and made some good choices. Way back then Forbes seemed to have good forecasting ability, I don't know about now. But subsequent to the tech boom of the 90's I haven't felt I was wiser than the average investor so this S&P index strategy is now the better choice for me - and it doesn't require any attention to the investment news of the day.
My wife watches market commentators and reads Kiplinger etc. She is more bold, comparing overseas funds etc. Yes dear

. I've never compared her choices to the hands-off S&P but the results seem to be similar. As we get older I don't want to stay fine-tuned to today's news but rather just let things perk along.
Tesla is the one stock stock today where I think their product will bury the competitors. But that's priced into the stock. So while it may be the next winner, it will take years for an investor to be rewarded.
Whatever. What works for someone may not fit changing times. YMMV.