But another sign of amateur design is bad hyphenation. Follow these rules:
• Hyphenate only between syllables.
• Don't hyphenate across a turned page, i.e., from a recto to a verso.
• The Chicago Manual Of Style doesn't allow more than three successive lines to end in hyphens. In my opinion, this is too liberal; I don't end two lines in a row with hyphens.
• Never hyphenate a website URL. If it's too long for a line, make a URL into an extract and break the URL at a backslash. The Chicago Manual Of Style lists four pages of additional rules for word division, e.g., not dividing personal names. The Chicago Manual Of Style allows dividing words with two letters (but never one letter) before the division. It doesn't allow leaving two letters after the division. This makes no sense to me. The reader should be able to recognize the word from the part before the division. The part after the division doesn't affect the reader's recognition of a word. I suggest instead trying to keep four or five letters before the division, and accepting two letters after a division.

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Go to source: https://freekidsbooks.org/wp-content/uploads/2020/01/FKB-Basic_Book_Design-Wiki-YA-high_school_lessons.pdf