100% agree you need to walk before you can run. Also while shiny stuff might be interesting, depending on where you work / what you code, the majority of the day to day will likely lean more on the basics anyway.
So a solid grasp of the fundamentals not only helps you learn more advanced techniques easier, it helps you work faster and more confidently on the business as usual items.
I personally find that a sign of a strong developer is working with the "basics" in often novel ways that improve efficiency, performance and maintainability of the codebase.
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100% agree you need to walk before you can run. Also while shiny stuff might be interesting, depending on where you work / what you code, the majority of the day to day will likely lean more on the basics anyway.
So a solid grasp of the fundamentals not only helps you learn more advanced techniques easier, it helps you work faster and more confidently on the business as usual items.
I personally find that a sign of a strong developer is working with the "basics" in often novel ways that improve efficiency, performance and maintainability of the codebase.