How can I extend my Linux partition with unallocated space?

First off, a simple solution would be to use GParted—it's a great tool for managing partitions. Just be careful, and definitely back up your data before making any changes. You can also create a new partition from Windows using the ext4 format if you want, but it’s important to note that your unallocated space must be adjacent to your current Zorin partition to extend it directly. Otherwise, you might need to move partitions around, which can get tricky if you’re new to this.

You should check if your unallocated 50GB is directly next to the Zorin partition. If yes, you can add it easily. If you want to be sure, just create a new folder in the Zorin root or in the /mnt directory and edit your /etc/fstab file to mount that space at startup. For instance, I have a 4TB hard drive mounted in my system by setting it up in fstab, and it's been working perfectly! But I get that it might sound a bit overwhelming at first.