Everyone who wants to improve their language skills has to struggle with the subject of memorisation at a certain time. Everyone sometimes feels that new words just disappear after a few days, even if we do so many things to remember them.

I don't know any golden method, but I think the most important thing is repetition. I use the Anki app. With this app I have to repeat new words many times at different intervals. With this app it is difficult to forget a word because just when I am about to forget it, Anki brings it back.