As others have said, Linux Mint is probably the best distro for absolute beginners. You'll have several desktop environments to choose from (the software suite that gives you things like window frames, the taskbar, the application launcher...). I like KDE Plasma and Cinnamon - Plasma is a lot more customizable, but Cinnamon is more robust and (IMO) better suited for beginners.

You'll have to unlearn a lot of Windows habits.

• :q! is very important, remember it.
• You won't download application installers from the internet, you'll have to either use the system's own package manager in the terminal (APT for Mint), a GUI front-end, or Flatpak.
• You won't be able to choose where software are installed.
• There are no lettered drives. There is a single root filesystem (equivalent to C:\ on Windows), and every other partition has to be mounted somewhere within that filesystem. Most graphical file manager applications take care of that automatically.
• Updates are very important. Fortunately they are much less of a pain in the ass. Graphical package manager apps usually offer automatic reminders, or you can use the terminal to update manually.
• The terminal is much more important compared to Windows, and you should learn basic things like navigating the filesystem, handling files and directories, how to use sudo (eq. run as admin), how to manage running processes (top, kill/pkill/killall), and how to use the package manager.
• Use manuals and the man command. The Arch Wiki is an invaluable tool for every distribution.
• Ask your questions. There will be dickheads, but most people will be happy to help.