Do they have a command list book for linux or ubuntu or not?

Hello and welcome to LQ.

There isn't any book published by Ubuntu that I know of. There are plenty of books both online and for purchase that teach basics.

Wikipedia publishes a list of commands considered standard, and a list of GNU core utilities.

There is no such thing as a list of Linux or Ubuntu commands. It is up to you which commands you install.

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I can understand why you would want a guide of all available commands - however - just having them in front of you wouldn't really help. You can always search the net for "most helpful Linux commands" and such - but just the commands outside of context and when they're appropriate for use isn't really of much help.

I find the best way to develop some chops with commands is to use Linux more often and spend as much time in the CLI as possible.
Learn how to navigate, make and remove directories, create and edit files, set ownership and permissions, learning how to search for files, directories and text inside them.

There's such a huge world to understand. The easiest way to get to know them is to discover them - then use them. Also - get used to entering them. If all you do is cut and paste them from web pages - you'll never really internalize them. You have to go through the motions.

Just this week I kind of rediscovered "tree" - which I had forgotten about. It's so incredibly helpful when it comes to "visualizing" inside the CLI. Learning options and flags for commands is mightily more important than the commands alone.
In the end - the more you use them in your tasks - the more they'll take root and grow.

The hardest part in the beginning is wanting to do something and not knowing how - and not knowing where to start looking. So group what you're trying to do into the function you're trying to accomplish. Trying to search for something? Hit up Google for "searching files Linux" and read around.

And always remember the man pages - "man tree" - help you tons in your journey...

Open up your browser and go to your favorite search engine and type this: advanced linux commands cheat sheet pdf

Of course, hands-on is a best teacher.

Or check out this link: https://oit.ua.edu/wp-content/upload...heat_sheet.pdf

This page (also down-loadable as a pdf) will tell you everything you want to know — and a lot you won't!
Unix Toolbox
This one is also sometimes helpful:
Linux Documentation