If a person knows many programming languages, it doesn’t mean that they earned the senior title. Someone can be an expert in different programming languages but can still be mid-level. Learning the principles behind a few languages can move you one step further. However, seniority doesn’t come with it.
If you're unfamiliar with Zettelkasten: These notes are atomic. The aim is to have one idea in a note. The connections between notes are as important as the notes themselves.
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