Re: e training
I live in València
Cycling here is very safe. Few cyclists wear helmets. Road cyclists and maintain bikers usually wear helmets, but most people just getting around don't wear helmets.
Scooters only appear to come from nowhere if you don't look. Crossing roads and cycle paths is very easy just remember the Green Cross Code. Maybe use a crossing.
I've never seen an eScooter travel at anything close to 30mph here not even on the road.
The only bad riding I've seen has been by tourists.
In the actual city centre the roads are mostly narrow and people walk. The extensive and good quality cycle paths and lanes are mostly outside the centre.