Do udemy courses expire?

Related questions

1. Does udemy give certificates?
2. Is it worth paying for Coursera certificate?
3. Does udemy always discount?
4. What does udemy stand for?
5. Can you make money on udemy?
6. Are certificates from udemy EdX and coursera of any worth?
7. How much does an udemy instructor make?
8. How much does udemy cost?
9. Is coursera no longer free?
10. Does edX give certificates?

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