Ubuntu 16.04 Default Partition Names - I don't know which is which

I just did a clean install of Ubuntu 16 and didn't change anything in the partitions. Now I have 3 partitions, and I don't know which partition is what. I ask so that I can increase/add a swap,and create the recommended partitions from the answer at Ubuntu 16.04 partition help (/opt, /root, /home).

This is what I have: GParted Screenshot

1. /dev/sda1 (fat32, /boot/efi, 512MB)
2. /dev/sda2 (ext2, /boot, 244MB)
3. /dev/sda3 (crypt-luks, not mounted, 465GB)
4. unallocated, 1MB

Is anyone able to discern how I could label these so that they make sense to a newbie?
Thank you!