<ul><li>Software development skills and craft can be leveled up by acquiring both abstract knowledge and concrete skills.</li><li>Examples of abstract knowledge include logic, while concrete skills can be TLA+, TypeScript, OOP, UML, Design Patterns, and DDD. Ruby on Rails is an example of a concrete skill.</li><li>The experience of coding in Objective-C for iPhone apps was found to be enjoyable compared to other object-oriented languages.</li><li>Developers thrive on problem-solving and need the opportunity to apply their skills effectively.</li></ul>

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