Will I no longer be able to use my laptop?
Will EVERYTHING be lost?
Will Windows 10 be installed without my wish?
Will I be unable to retrieve ALL info?
DOES ANYONE KNOW ?
Mostly it means that the "end of life" (end of support, security updates, bug fixes) for Windows 7 and 8.1 is coming many years earlier than Microsoft had promised, -IF- you have a modern CPU. Your computer running 7 or 8.1 will continue to work, but it will rapidly become insecure and more dangerous to use on the Internet.
This was expected to happen in 2020 for Win7 and 2023 for Win8.1 -- but now Microsoft says that only applies to older hardware. If you have newer hardware, you will have to upgrade to Win10 to have security and bug fixes.