Keeping it simple
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Front-end developers should prioritize mastering HTML, CSS, and JavaScript before reaching for tools like Sass, LESS, Bower, or Bootstrap. Tools have their place, but they amplify both skill and misunderstanding — a weak grasp of CSS fundamentals like box models, specificity, and inheritance can lead to worse outcomes when using preprocessors. Package managers like Bower make it dangerously easy to bloat a codebase. Core language knowledge is the real constraint on how effectively any tooling can be used.