You can use apps which are based on this system such as Anki or Memrise, or you can write lists of word in a notebook using the Goldlist method, which is also very popular with many polyglots.
Podes empregar aplicacións baseadas neste sistema coma Anki ou Memrise, ou podes escribir listas de palabras nun caderno co método Goldlist, moi popular entre moitos políglotas.