Questions about ASUS E210MA

No, charging via separate (supplied) power supply unit

Yes, the change from Win 10 S to Home goes smoothly, here is more info about it: https://support.microsoft.com/de-de/windows/wechseln-aus-dem-s-modus-in-windows-10-4f56d9be-99ec-6983-119f-031bfb28a307 For your device, it depends on what other requirements you have (applications, weight, functions, etc.) and the price...

Yes, at least only a limited version, i.e. you can only download apps/programmes from the Microsoft Store and not install them "yourself".

Again, it's not a smooth experience, the components are simply not suitable for Windows 10. You are welcome to read a test report on this: https://www.testberichte.de/p/asus-tests/e210ma-testbericht.html

Since speed is judged individually, it is difficult to say, but this notebook can do everything that is desired and the battery lasts longer, which is helpful on the road. It should be noted, however, that this device has Windows 10 in S mode and therefore only supports programmes from the Windows Store.

That's not so easy to answer, for what purposes (office, gaming, etc.) do you want to use the notebook, how many windows do you want to have open at a time?