There will be things to learn and unlearn, but modern Linux distros are fairly smooth sailing for basic tasks if your hardware supports Linux well. Laptop support is a little more spotty, where there may be issues with suspend, or the Wi-Fi needing 3rd party drivers, but desktops will probably work without much fuss (and there are plenty of laptops with no issues).
Gaming has been made much easier thanks to wine and proton, particularly valve’s contributions. For steam games, many of them will just work out of the box or after ticking a checkbox. ProtonDB is invaluable for quickly seeing how well a game will run on Linux.
But as you’ll see as you read some of the reports on ProtonDB, there will likely be a more troubleshooting than you’re used to on windows. As long as you know how to Google the name of your distro + the problem you’re seeing, you’ll usually find a solution.
You don’t need to be a terminal master to use Linux nowadays. But most things are easier to explain with terminal commands than with step by step gui instructions, so many guides online will have you use the terminal to some degree.
Honestly, the best advice I can give is just try it. If you have a spare drive (internal or usb), just go ahead and install Linux to it. If you want to be extra sure you won’t do anything to your existing windows install, remove the windows drive first (or disable it in bios). Then play around with things and see how it feels.