How do children learn in open Learning? Do they learn all by themselves?

Typically children decide how they want to approach any task / learning. They do not need to do it all by themselves. They are free to choose any resource – could be books, websites, videos, peers, parents, a teacher or an expert or a workshop or course or just learn by doing something. All of the above is dynamic, as the learner moves from one way / resource to another as his or her learning evolves.
Important for parents is to not impose their style, rather observe, recognise and respect the child’s learning style and then with sensitivity, add value to the same. Which is why the parents role isn’t about teaching or about quantity of time, rather one of quality.