You finished the course. You took notes, you followed along, it all made sense at the time. Try this now, without looking anything up: explain the three most important ideas from it to somebody at the next desk.
For most people the honest result is one idea and a vague feeling about the other two. Nothing is wrong with you. That is simply how memory works. What you understood once and never used again fades quickly, and understanding something while a clear teacher is walking you through it feels exactly like knowing it, right up until you need it alone.
The common response makes it worse. You reread your notes, they look familiar, and familiarity feels like memory. It is not. Recognising something on a page and producing it from nothing are different abilities, and only the second one is any use at two in the afternoon with a broken build.
What actually works is less comfortable and much cheaper in time.
Pull it out of your head instead of putting it back in. Close the notes and write down everything you can remember about a topic, then check what you missed. The effort of reaching for something is what makes it stick, and the gaps you find are a precise list of what to look at again.
Come back on a schedule rather than when you feel like it. A few minutes a couple of days later, again after a week, again after a month. Each return takes less time than the one before, and after three or four it tends to stay.
And put it to work as early as you can, even artificially. A small script that uses the thing. A question in review where it applies. One real use is worth several rereadings, because now the knowledge is attached to something you did rather than something you watched.
None of this needs an app or a system. A line in your calendar that says revisit the database course, and fifteen minutes with a blank page, is enough.
Monday: pick the last thing you studied properly and write down everything you remember about it before you open a single note.
– Asael Shinder
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