Before using or selling source code, understand its license — it defines what you may and may not do.
MIT
Very permissive: use, modify, and sell as long as you keep the license text.
GPL
Copyleft: derivatives must also be GPL and open-source.
Commercial
Paid code often limits use per domain/project and forbids reselling. Always read the terms.
Conclusion
Choose MIT/Apache for flexibility, GPL for open-source, and read commercial licenses carefully.
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