https://oldenglish.info/advpronunciationguide.html
English used to be phonetic, it's just people started changing the way they pronounced vowels, but the spelling stayed the same. For example, both the k and the gh in "knight" used to be pronounced.
Let's take a moment to appreciate how much effort this YouTuber puts in just for us (has nothing to do with this channel being how they pay their bills, they do it all for us!)