- Get linux distribution image of your choise
- get a USB-stick
- get a new SSD-drive
- write the image on a USB-stick
- detach the old windows drive (for now)
- install the new SSD-drive on another slot
- put the USB-stick in a USB port
- set your UEFI/BIOS to boot first from a USB drive
- boot in to the installer or "live environment" (depends on the distro)
- install Linux on the new SSD-drive (quite strait forward process)
- system reboots after install, so remove the USB-stick before it starts up again.
- check that it successfully boots in to a desktop environment.
- at some point reattach your Windows SSD-drive back and go to the UEFI/BIOS and set your Linux SSD-drive as the primary boot drive
- after that you learn as you go, which means shitload of googling and registering to the relevant forums.
- if you use AI instead of googling, tell it everything about your distro including kernel and distro versions. Be very careful running any commands you don't understand.
Good Luck