You can't learn that in a book. Use other ppls APIs, read other people's APIs, design own APIs, overcome the desire to say "FK U" to everybody who criticises yo

You can't learn that in a book. Use other ppls APIs, read other people's APIs, design own APIs, overcome the desire to say "FK U" to everybody who criticises your APIs, edit your APIs, rinse&repeat. It becomes interesting once you start to use/read "hard" or "shitty" APIs. You may discover that many of them aren't either of their given labels, but that they solve really complex problems, that can't be solved (even) more intuitively.