Learning is a permanent change in behaviour brought about by experience. Learning is the sudden or slow acquisition of insight into the rules governing certain relationships in the environment. Learning is the discovery of new facts and relating them to those already known. The more practice the more successfully it is learned. Using a language is a skill which has to be learned by practising it.
Successful practice is more effective than making mistakes.
The amount of practice needed depends upon the complexity of the skills involved. It is better to break down a complex skill into separate components and practise them separately. The more difficult what is to be learned appears to be, the more unlikely it is to be learned. The more pointless what is to be learned appears to be, the more unlikely it is to be learned. The more mysterious what is learned appears to be, the more unlikely it is to be learned.