Windows 10: What happens to my windows 10 when i install a new OS as my main?

So guys i am currently running windows 10 but want to install another OS as my main , so i was wondering what happens to my windows when i delete it? Will i be able to get it back on my laptop if i want to go back to windows(it was preinstalled by lenovo and is orginal)?? Is there like a factory reset which deletes my current OS and brings back windows as if my nothing happened? My laptop is lenovo thinkpad T580 Thank you

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Installing Windows 10 on New PC?

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Installing Windows 10 on New PC?

What's your intended PC specs ??