Recently I was invited to present a talk about front-end development at a company event of my current work, which I did a couple of weeks ago. I was pretty nervous about it mostly for two reasons: a) I never did a presentation to a large audience like this(about two hundred); b) I thought that I needed bring the current most relevant content to that presentation. While I was making the presentation slides I realized that the second reason was about the complexity of front-end development nowadays.
CSS is a convenient programming language, we can be as lazy developer as we want and it will still work. I assume that you know what the results will be if you choose the lazy way. We share techniques and philosophy with software engineering principles, like DRY, Single Responsibility, Open/closed principle, Separations of concerns among others. DRY is a useful principle to get started with CSS if you aren’t yet.