Mr. Market

In The Intelligent Investor, Benjamin Graham introduces an imaginary investor he calls "Mr. Market". Being a manic-depressive, Mr. Market's mood swings from extreme optimism to extreme pessimism. This creates higher volatility in stock prices. And you can always ignore Mr. Market because he will return tomorrow offering a new price. Tech stocks especially have erratic swings due to market psychology, which we can use to our advantage.

Optimism, usually driven by greed (and/or FOMO), presents good selling opportunities while pessimism presents the opportunity to buy at a reasonable price because valuations will be favorable. Unlike technology, human psychology doesn't change over time. Which is why opportunities will be plentiful in the future.

There are times when Mr. Market's offer will be plausible and rational. When this occurs, a security will be trading close to its intrinsic value. The wise approach to determining intrinsic value is to calculate your own valuations by researching a company's operations and financial position. From there, you can either accept an offer to buy/sell or ignore the offer altogether. There will always be another offer tomorrow.

For more info regarding Mr. Market and stock price fluctuations, read chapter 8 of The Intelligent Investor by Benjamin Graham.