Excellent alternatives to Windows and Mac and they're FREE.
Learn The Various Linux Operating Systems (exploring the most used).
Ubuntu is a free desktop operating system. It’s based on Linux, a massive project that enables millions of people around the world to run machines powered by free and open software on all kinds of devices. Linux comes in many shapes and sizes, with Ubuntu being the most popular iteration on desktops and laptops.
• Ubuntu "Ubuntu Tutorials are project-based, step-by-step guides to doing amazing things with Ubuntu. From installing the OS in the first place to packaging your first snap, we're here to help you on your way."
• Tutorials Point "This tutorial looks at the various aspects of the Ubuntu Operating system. It discusses various features, flavors, and working of the Ubuntu desktop edition. A comparison is made against software which we would normally find on a Windows operating system. There are chapters that focus on the server version of Ubuntu. This tutorial also includes separate chapters for those who are interested in understanding the virtual machines and cloud aspects of Ubuntu."
• Lifewire "Ubuntu (pronounced "oo-boon-too") is one of the most popular desktop Linux operating systems. The term Ubuntu derives from South Africa and roughly translates to "humanity toward others," a nod to the Ubuntu project's commitment to the principles of open-source software development. It is free to install and free to modify, although donations to the project are welcome."
• Make Use Of (MUO) "So you’re curious about Linux, and you heard Ubuntu is a great place to start? Maybe you’ve heard of Ubuntu and have no idea about this thing called Linux? Either way, you’ve come to the right place. This guide will teach you everything you need to know about Ubuntu in easy-to-understand language."
• Gnome "Free Microsoft training delivered by experts. Learning paths are curated courses brought to you by Microsoft Virtual Academy (MVA) to help you increase your proficiency in the latest technologies. Build valuable skills through video tutorials, demos, assessments, and more. Plus, earn MVA badges for completed learning paths, and share them through email or social media, such as LinkedIn, Twitter, and Facebook. Get started today!"
• Fedora Our courses are designed to keep you on track, so you learn to code “today” not “someday.”
Kubuntu is an official flavour of the Ubuntu operating system which uses the KDE Plasma Desktop instead of the GNOME desktop environment. As part of the Ubuntu project, Kubuntu uses the same underlying systems.
Find out how you can use Ubuntu to power your AI and ML ambitions from developer workstations to the cloud.
An easy and elegant way to use your computer, GNOME 3 is designed to put you in control and get things done.
Less setup, more innovation. Choose a flavor of Fedora streamlined for your needs, and get to work right away.
Kubuntu is an operating system built by a worldwide community of developers, testers, supporters and translators.
Go-to tools to help you get Linux installed on your computer.
UNetbootin allows you to create bootable Live USB drives for Ubuntu and other Linux distributions without burning a CD. You can either let UNetbootin download one of the many distributions supported out-of-the-box for you, or supply your own Linux .iso file.
Rufus is a small utility that helps format and create bootable USB flash drives, such as USB keys/pendrives, memory sticks, etc.
Etcher is a free and open-source image burner with support for Windows, OS X and GNU/Linux. It makes USB and SD card image burning as simple and fast as possible.