Writing book after Mincha Erev Shabbos

Question: [Wednesday 19^th Iyar 5780]

I know one is not supposed to do work on Erev Shabbos after the time of Mincha. My question is if I can work on a book I am writing after this time, or is writing considered work?

Answer:

If the book is of words of Torah and one has finished all his Shabbos preparations, or has someone to do so for him, then one may write it even after Mincha Ketana on Erev Shabbos. If it does not involve Torah words, then one should only write it in ways permitted on Chol Hamoed, such as by typing on a computer [which is permitted on Chol Hamoed, as its not considered real writing], or writing on a piece of paper with a slant.

See here for the full details of this matter:

https://shulchanaruchharav.com/halacha/chapter-2-learning-and-doing-other-activities-on-erev-shabbos/