We can't remember everything, and sometimes what we do remember is faulty.
We all miss-remember things - insisting something occurred in a certain way, being adamant about it, then being proved wrong at a later date. Our memories are not snapshots in time, but are like videos we can manipulate and alter - intentionally or unintentionally. Being aware of this fact, and acknowledging that you memory can be false, is one step on the right path to dealing with it. Additionally, we can't remember everything (did I just say that?), so we need ways of choosing what we do want to remember, and techniques to recall them accurately. Repetition is one of these techniques (see what I did there). The more we repeat something, the more reinforcement we provide it.
Whether considering theory based learning, or practical skills, the more we practice something the better we get at it, the more we repeat information the more likely we are to remember it.
Repetition alone may not be the right tool for some learning skills. If I am trying to learn long formulas or sequences of data I might chose to use Mnemonics combined with repetition, to help me learn. Whether used alone or in conjunction with other memory aids, repetition builds muscle memory. The act of repeating a task or thought will help your brain, or other muscles, remember, and in time this will help you become more capable and skilled at what it is your are trying to learn.
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