People wonder why children learn languages so easily, and adults - not so much.

The answer may be very simple, if we have the understanding of the mind, memory and the specifics of the languages themselves. The memory works with use of patterns which are associated. Mathematically it might be presented as a set of graphs (elements having "connections" to other elements).

Memory is actually in everything, including physical memory of sensing. But ultimately it is "translated" into mental pictures somehow.

When learning foreign words, or grammatics, you may remember how things are associated. But the learner should avoid something which could be called a "flat" or "dry" learning: just e.g. reading words and trying to remember them. It's the worst method, yet the most commonly used. (It is interesting, btw, that schools require memorizing, but do not teach about using the memory effectively).

Memory is actually commonly thought of as "a storage". I'd say that it's a frequency: the frequency (containing mentioned pictures) to which you mentally connect gives you the "display" of the demanded image.

The unconscious part contains memories that you "forgot"; the conscious part, which might be - partly - unconscious , contains memories that you "remember".

Mastering memory means mastering and expanding your mind, in fact. I.e. making the unconscios - conscious.