Really, how to learn how to understand and use Linux
Nothing worthwile in life can be learned by watching a ten-minute video. The best way to learn Linux, and especially the command line, is to use it. install it, use it, and when it breaks (as it may well), figure out what went wrong and then find out how to fix it.
I'd honestly recommend using a spare system or even a hypervisor to manage a few virtual machines, and install a couple of distros, one of which, after your first attempts with others) could be ARch Linux (which will require some reading of the Arch Wiki and managing the command line). this will give you a better understanding of what is required to operate the computer, and what each of the various components do (the kernel, disks and filesystems, networking, sound, memory, init systems, graphical interfaces and the like). Once you've put your own OS together, you will know a great deal about how Linux works, and how to use and fix it. You'll be well on your way to having he knowledge required of a systems administrator, even on a small scale. Single-board computers are an inexpensive and readily available way of getting Linux systems for testing and discovery.
Why use it.
Windows 10 is reaching the end of its support by Microsoft, and many computers will not be able to install Windows 11. As a consequence, many people are going to want to install and use Linux to avoid scrapping an otherwise valuable bit of kit. Honestly, setting things up from a command line will give you greater understanding than just installing Ubuntu (which spoon-feeds the user!) You will read a good deal, and do even more; all this will serve you well, and you will learn. Have an idea of what you want to use it for—set up a server, use it as a workstation or router/firewall, and go for it. If you feel confident, think about one of the "harder" Linuxes, you'll end up with a better understanding of how Linux works.
Failing that, install your hand-holding distro of choice and just determine to do as much from the command line as you can. Use it to install and set up software, learn how to edit config files by hand. Will it be easy? No, it will not. But it will certainly be rewarding and give you insight into how things really work, and you will gain the confidence you need to move forward. You will find many tutorials on YouTube and the general Web to get you started, and when you begin to apply the lessons you're learning, you will curse at your computer, Richard Stallman, Linus Torvalds and their kin. And at the end you will have a powerful, customisable and versatile operating system. Will it do everything you want? Probably not right away, or at first glance (see Linux for the common person); if you're a gamer, you will still mostly need Windows (Linux gaming is getting better but it's not quite there just yet). There is some software that's just not available within linux; Microsoft's Office and all Adobe software is Windows/Mac only. There are alternatives, but of course they aren't 100% what you're accustomed to; you're pretty much forced into good deal of re-learning and a change of workflow. Sometimes it's possible, after a little tweaking, to get what you want, and whilst you may se that as a disadvantage, i see it as a positive as I learn to solve problems and try new solutions.
yourself.
Of course one of Linux's strengths (the choice and customisability) can also be a weakness as the decisions to be made can be overwhelming to a newcomer. Developers have created desktop environments with newbies in mind, but there is almost too much choice; thankfully it's easy enough to install and use almost anything. Many distros are developed with newbies in mind (Pop!OS and Linux Mint come to mind, each designed to make Apple or Windows users comfortable. I've tried both myself, and installed both these distros for other people (likely much less techy than you…) and they're still having a good time. It's easy enough, and if you're reluctant to install it on a system a first, most distros allow you to run it purely from an ISO image installed to a USB stick, withut touching the computer itself.
If you have some basic *nix knowledge and patience, then Debian Linux would be my recommendation. They have installations for both server and workstation use and their support forums are pretty darned good. If you want an install that just works, Debian Stable is your best pick, but don't overlook Testing, which incorporates more updates to software so you can stay abreast of developments. If you need more leading edge, Debian Sid (aka "unstable") updates more frequently (so it's "unstable" in terms of its build not the daily running). Beyond that I'm not making any recommendations, unless you want to discuss things in more detail!
As a footnote, if you have a non-upgradable-to Windows 11 computer but you don't want to install Linux on it, I will accept it.
$ xclip -o | wc -w
859