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Mastering curl: interactive text guide
(antonz.org)
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With CLI, all you need for most use cases is "command --help" or "tldr command" or the beginning of "man command". Been using curl for ages with just that. This blog post is only if you want something in depth to master it, not a requirement to use it.
A GUI is all about figuring things out and it is often pretty clunky compared to a cli, imo.