Microsoft provides generic product keys for Windows 10 that can be used during installation or for activating a fresh installation. These keys do not activate retail versions bought from Microsoft Store or other retailers but can be used for evaluation or installation purposes.
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Activating Windows 10 without a key is possible using various methods. However, it's essential to note that using these methods may not provide the same level of support and warranty as activating Windows 10 with a valid product key. Additionally, some methods may not work due to changes in Windows 10 updates. how to activate windows 10 without key
If you're facing financial constraints, consider exploring options like: Microsoft provides generic product keys for Windows 10
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(example for Windows 10 Pro):