The Linux Programming Interface: https://man7.org/tlpi/
Advanced Programming in the UNIX Environment, 3rd Edition: https://www.amazon.com/gp/product/0321637739
Advanced Programming in the UNIX Environment, 3rd Edition: https://www.amazon.com/gp/product/0321637739
In the linked Q&A video with Maisem, you spoke about buying books on Linux to make SSH work. Which books, if you don't mind me asking?