Or that the "right way" to do things have changed several times over the years, and you have to figure out if that's the "old right way" or not, because they both are still available.
The main example I'd give of that is laying out elements. Best practice, at one point, was putting two inline-block divs next to each other, then it changed to 'everything flexbox,' then it changed to 'everything grid.' In my experience, really, you wouldn't lose a job for using any of the three of those, as long as you're being conscious of the limitations of each method, and, in specific cases, each is the right tool for a certain job. Best practices change in lots of languages, and paradigms shift. CSS is flexible, and has always felt a little more like art than science. I get why a lot of people don't working with it, I enjoy writing it though.