macOS

FWIW, a lot of Windows "snap" behavior is built in, but it requires Monitors as Separate Spaces to be enabled.

Window Tiling: https://developer.apple.com/videos/play/wwdc2024/10124/?time=211

Also, one of the coolest things you can do with a multi-button mouse (I like the Razr DeathAdder a lot) is set up a button for Show Desktop and another for Show All Open Windows under System Settings -> Desktop & Dock -> Shortcuts (all the way at the bottom). You can use the buttons dynamically, so if you want to drag a picture off your Desktop into an Open dialog or an app window, that is possible. Or drag some text out of an open app into another window, etc. Just start your drag and hold down on the buttons to help you navigate to the app/window you want. You can also you cmd-Tab with the mouse held down as another way to switch apps to drag and drop content between them.

Also, if you have a window open in the Finder and you want to switch the current Open dialog to that window, just drag a file from Finder window onto the Open dialog. Unlike Windows, it doesn't move the file there (always a weird and stupid idea IMHO) but rather just points the Open dialog at that directory with the file highlighted in it.

While you're in Desktop and Dock, I always like to set up my left hot corner as Don't sleep and my right as Sleep Now too.

And finally, if you miss the Start menu in the left corner, I would recommend Butler as the easiest way to make a popup app launcher. Although honestly, I use cmd-spacebar to launch apps most of the time.

Oh, and if you're new to macOS, Quick Look is freaking amazing! Almost anywhere in the OS, selecting an image or a file and tapping the spacebar will usually bring up a preview of the file or image. Super, super useful. In the Finder, you can even then just start navigating around to different files and the preview will change to whatever you have selected.