Learning to say No and learning better about what to say No to is definitely a helpful life strategy, in my experience. For example, saying no to PHP -- whatev

Learning to say No and learning better about what to say No to is definitely a helpful life strategy, in my experience. For example, saying no to PHP -- whatever it's merits -- means being able to say yes to Java, Python, C, Go, Clojure, whatever. Saying no to Windows means being able to say yes, more, to Linux. Saying no to meetings means saying yes to writing a new feature or fixing a bug. Saying no to interruptions means saying yes to focus. And so on. You have only so much time in the day, week, year, rest of your life. It's not that there's no value, benefit or use to the thing you're saying no to, it's that the alternative will often give you more of those things, or otherwise help make your life better in some strategic long-term way, or in some non-tangible way like making you happier.