For those interested in learning old English, I’ve been going through Oswald Bera by Colin Gorrie -

https://colingorrie.com/books/osweald-bera/

Basically it’s a full blown story/graded reader with no modern English apart from vocabulary. You build an understanding of the language as you read the book and what is initially gibberish becomes quite clear as you progress . It does help if you’ve had a lot of exposure to German ( vocab and grammar), or barring this any case inflected language.

What’s noticeable is that it’s about 200 pages long, so the story gets quite sophisticated , and rather unexpectedly the book is a bit of a page-turner !