Knowing CSS is mastery to Frontend Development - Anselm Hannemann
Briefly

To be a master at frontend development, it's crucial to understand the underlying mechanisms of the languages and tools we use, beyond just the frameworks.
Debugging JavaScript and CSS errors is significantly easier with an understanding of the browser's ecosystem, which helps in addressing issues directly without reliance on tools.
Many developers miss simple solutions like utilizing CSS for multi-colored backgrounds or icons, instead opting for complex approaches that complicate implementations.
A solid grasp of CSS enables developers to provide straightforward solutions rather than relying on oversized npm dependencies, reinforcing the importance of foundational knowledge.
Read at Anselm Hannemann - helloanselm.com
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