I guess you have to practice the opening lines against bots or random people, and regularly revise the opening.
How to remember opening lines
There is an opening section aswell so maybe good to try learning there aswell,
https://www.chess.com/openings
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I recently bought the playing the caro kann counter-attacking repertoire by lars schandroff I want to learn the opening lines of the caro kann but i am not able to remember the opening lines. If someone could help it could be nice