Group Discussion: Professional Development

There are lots of ways to expand your development horizons - books, Pluralsight, YouTube, pair programming, certification training, instructor-led classrooms, etc. What forms of professional development / training have you found the most helpful? Why? Which forms just don’t work for you? When you go to learn a new (to you) technology, where do you start?

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This will be a group discussion. Come prepared to contribute or just to listen!