LUKS2 (Linux Unified Key Setup) refers to disk encryption, LUKS2 allows different key derivation scheme that can make password harder to crack.
Captive Portal is a WiFi AP function, that forces you to see a page (e.g. login page) before you cna use it. I have seem public WiFi that forces people to watch ads with this feature.
I used web version of lemmy.world on desktop (1080p monitor) yesterday, coming from old.reddit + RES, I really hate:
The web trend to leave white space on both side of websites, it's space inefficient and causes thread with longer title to take two lines to display.
Everything has a thumbnail slot even if it's just text thread, makes each thread took more height to display, also space inefficient.
You need to be authorized to even subscribe/join to a community (that is not on lemmy.world).
Image expand button is hard to spot for me, and I am pretty sure some threads with image didn't have expand button.
GParted can also move that partition to end of drive.
Try GParted live iso image.
It says "Subscription pending"