Teams works pretty identically between mac and PC, but acknowledge that there are other parts of Office 365 that are really Windows first. I would suggest describing your OneNote issue in the Onenote forum.
Trying to use a team as a template - the Tabs content (mainly website URLs) don't copy across..
Correct, the current option to start with a copy of an existing Team brings across tabs in an unconfigured state, which is pretty rubbish. I've built provisioning solutions for my clients in the past using calls to the graph to overcome this, but it's not something particularly simple to achieve.