These are skills you might find useful as a freelance web developer. You’ll notice they are not relevant to actual web development. If you’re working in a larger environment, it can still be useful to note the basics of these: someone who understands basic limitations of other people’s jobs is usually easier to work with, and can sometimes provide cross-disciplinary insight. However, in a larger organization you’ll also probably have another person — if not a department with multiple teams — to worry about these things, so it’s not as crucial.
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