Stephen Krashen is a very smart man who knows a lot about how people learn languages. He has studied this topic for many years and has come up with some ideas about how people can get better at speaking and understanding different languages.
One thing that Dr. Krashen thinks is very important is something called "comprehensible input." This means that when you are learning a new language, you need to have someone talk to you in a way that you can understand. If the words are too hard or if the person is talking too fast, you won't be able to understand what they are saying and you won't learn as well.
Another thing that Dr. Krashen believes is important is something called "the affective filter." This is like a barrier in your mind that can stop you from learning if you are feeling anxious, scared, or nervous. So it's important that you feel comfortable and relaxed when you are learning a new language.
Dr. Krashen has also studied a lot about how people learn language naturally, like how children learn their first language. He believes that adults can also learn languages naturally if they are given the right kind of input and if they don't feel nervous or anxious about making mistakes.
Overall, Dr. Krashen's ideas about language learning are very useful for anyone who wants to improve their language skills. By making sure that you are getting good input and feeling relaxed and comfortable, you can become a better language learner just like the big kids!