Spaced repetition means you learn things over a period of time, instead of all at once.
Imagine you are playing a memory game.
You have to remember where different cards are. You could try to do it all at once, but that might be too much! You might forget some of the cards.
Instead, you can try spaced repetition.
First, you can look at all the cards once.
Then, you can take a break and come back later.
Next, you can look at the cards you got wrong last time.
Over time, you keep looking at the cards and focusing on the ones you need to remember.
This helps your memory get better because you are giving your brain time to remember things at the right pace.