When I was a child, my father wrote a novel about our family life. Back then, he used to write it by hand, and I could type it on the computer. That was our very first computer and very special for me. Moreover, I earned some pocket money. Then, due to not having enough time, he didn't pursue his writing hobby for years. Now he's retired and would like to write a novel about his professional life.
He's thinking of something inspired by the story of “The Devil Wears Prada”. Of course, he wouldn't come close to a Lauren Weisberger, but he would like to pick a bone or two with some former colleagues.

Simultaneously, he thinks that he can't write properly anymore. If he does that, then in his opinion it should be something proper.
I've observed that you've been exchanging ideas about books. But do any of you also have experience with writing? If yes, have you also attempted courses or something similar online? Thanks in advance for your help, and any tips are appreciated!