What skill level do I need to ride a bike? Or for my daughter to be safe on the road?

I'm not a cycle trainer and obviously professionals could do a much better better job of developing and codifying advice

But from observation it seems to be things like:

• Kids need to allow more space before they attempt to "take the lane" because, for example, they can't be seen easily over the bonnet of a 4x4.

• Say you're following a car through a narrow piece of road, as an adult you can see over the top and get a sense of what's happening up ahead. And drivers waiting to come through the other way can see you coming. A child can only really see the back of the car in front and the drivers waiting to come through in the opposite direction have no prior warning a cyclist might be there.

• Pulling out at T Junction. If there are parked cars either side, kids can't as easily see over the top to check what might be coming and have to pull out further into the road. Similarly, cars that want to turn in don't know the kids is there until they've started the turn.

Sound's like something is amiss in their training if they haven't been taught that when approaching a junction (from minor rd to major), if there are parked cars on either side of the junction on the road they're about to join (major), they should not be stopping dead on the give way lines as you know your view will be blocked. They should be "peeping and creeping" to where they can see and be seen. If it's done really well your kids may have been taught to cruise up to the give way lines with in 'set position'.
If they have to stop they're already in set position* but if it's clear they can proceed.

*I think this gives drivers behind a subconscious confidence that the cyclst in front knows what they're doing and are less likely to do that aggressive passive overtake from a static position.