We use Google Suite, Zoom, and the Italian ed ministry's platform which has been upgraded since the lockdown started.
No extra hardware as far as I know. Italian internet providers have given all clients extra free giga. The kids who don't have PCs are using phones. I have 300 students and all have access to smartphones. (I appreciate that may not be the case for everyone, everywhere, but here in Southern Italy that's not been an issue)
We have leeway as to when we do the lessons, like one of my classes this morning is usually 8am but we moved it to 10am when they would have had Phys ed.
I presume subjects with an elevated amount of practical work are concentrating on the theoretical side for now, but I don't know because it's not my area.
I also don't know who is looking after smaller non school age children- other parent, grandparents, babysitter I guess. Govt has funded extra money to pay for childcare via childminders and babysitters for those parents in essential jobs.
Not much training to be done tbh. You watch a few tutorials and then start.
Chloe- I don't know if that was addressed at me, but I didn't say Microsoft hadn't crashed. We don't use it so I wouldn't know. I know Google have offered free access to Suite for Italian schools.