If you want to learn something you have to investigate problems...
If you use first workaround to achieve the goal, you learn less than if you fully understand the problem you are facing.
Stack Overflow
Q&A for professional and enthusiast programmers
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Web Applications
Q&A for power users of web applications
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Server Fault
Q&A for professional system and network administrators
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Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
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Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
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Mathematics
Q&A for people studying math at any level and professionals in related fields
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Programmers
Q&A for professional programmers interested in conceptual questions about software development
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Computer Science
Q&A for students, researchers and practitioners of computer science
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