Effective revision system.
The obvious fact is that in order to permanently remember learned words or phrases, it is necessary to repeat them frequently at appropriate intervals. Therefore, a good online English course should be equipped with an appropriate repetition algorithm, which will optimally plan the cycle of revision of learned words for the student, so that learning and remembering them is as effective as possible. When creating memory algorithms, research on the work of the human brain is often included in order to optimize them. Based on the analysis of the results so far, this algorithm determines the number and frequency of repetitions by itself. Such a personal approach to the learner makes the learning outcomes really fascinating.