If you really want to understand Linux and become fluent between distributions, you should try Slackware. In fact, once you use Slackware, the BSDs make more sense. The learning curve is steep, but after you climb it, you'll be familiar enough with enough concepts at a low level that you can take on just about any task in your Dev or server environment confidently; your toolset will be diverse and powerful.
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If you really want to understand Linux and become fluent between distributions, you should try Slackware. In fact, once you use Slackware, the BSDs make more sense. The learning curve is steep, but after you climb it, you'll be familiar enough with enough concepts at a low level that you can take on just about any task in your Dev or server environment confidently; your toolset will be diverse and powerful.