Neither is true.

In Finder you could always drag and drop a file to move it. (In certain cases I forget the details of, holding Command is necessary to move instead of copy, as indicated by the cursor.)

Since about 8 years ago, you can also move a file via the keyboard by selecting the file, hitting Command-C to Copy, navigating to the new folder, and hitting Option-Command-V to Move the pasted file. This doesn’t match Windows’s Cut/Paste workflow, but I think Copy makes more sense as a first step. For consistency with Cut elsewhere, one would expect Cut to delete the file until it is pasted, but on Windows it doesn’t.

Finder windows are resizeable in the same way as all other macOS windows. In older versions you had to drag the drag handle in the bottom right. For a while now, you can drag on any window border, when the cursor turns into a double arrow. You can also click or Option-click the green window button to make the window full-screen or zoom it to show all contents.

Yes it does. You can use the mouse, or shortcuts cmd-c, followed by cmd-option-v. And what on earth do you mean “Nor you can resize the window.” Nonsense. You’ve clearly never been within 6 feet of a Mac!