Learn Linux
How to learn Linux from complete beginner to intermediate:1. Linux Introduction Linux Introduction
2. Beginner Linux Journey
3. Beginner Linux Commands
4. Beginner to Intermediate Linux Tutorials
5. Intermediate Top 100 Linux commands
6. Intermediate Linux Handbook
7. Intermediate to Advanced nixCraft
A good Ubuntu book Ubuntu Linux Unleashed
Ubuntu is based off Debian
Red Hat Enterprise Linux search for RHCSA/RHCE books
Red Hat is based off Fedora
Rocky, Alma, and Oracle Linux replaced discontinued CentOS.
A great all-around Linux book Linux Pocket Guide: Essential Commands