you get to the point of partitioning your system.
Windows doesn't support much flexibility with regards to partitioning or at least didn't the last time I installed it.
Linux is very flexible in this area.
Rather than using automatic partitioning I always use manual partitioning. I generally go with the following basic idea.
/ (150 to 200 gbs)
swap (14 to 20 gbs)
/home (the entire rest of the drive)
If you're using UEFI you'll have to modify that to adjust that for the extra partition it needs. I normally don't use UEFI and disable it if possible.
To understand the partition terms above:
/ = the root drive. This is somewhat equivalent to the C: drive in Windows. For instance where program files, Windows etc. reside.
swap = A simulated memory area created on your hard drive to give the system a bit of memory overhead when it runs low on conventional memory. Windows has a similar function but it creates it on the fly on the C: drive rather than dedicating an actual partition to it.
/home = All of the user data. Similar to the C:users directory in Windows.
This is a very simple partition scheme. Linux can get much more complicated. I just haven't had the need to go there.
Why this works well is that it leaves open the door to reloading your system without losing your data. Should the need to reload occur you once again choose manual partitioning during install but this time you choose to NOT format the /home partition and only format the / partition. This leaves your user data completely intact and immediately available after reload. During reload you set up the same username and password. You'll be able to log in to your original user directory after reload.
I would suggest doing several experiments when you first start playing with Linux versions especially since you are using the raid setup.
If you have any questions let me know.
A great website for discovering all the variety in Linux versions. https://www.distrowatch.com
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