Review any material you learn
It might be challenging to find the time to review any material you've covered in your lessons, whether you're learning through an app or a language school. If you have small children or work full time, this may be especially true. If you want to successfully commit this information to memory, you must take the time to examine the material you have already learned.
It might be helpful to create a study schedule at the beginning of each month if you find it difficult to find the time to review your course material. Be honest with yourself about how much time you have available, and schedule periods of time for review. These might only last for 15 minutes. Many people find that studying little and frequently is easier to manage than scheduling in 1- or 2-hour periods.