CW is the only digital mode that the mind can work with directly! Memorizing the characters is the tough part.... There are mnemonics that can be used to make it easier. The cadence of certain letters can make for easier memorizing. An example would be for the letter L, in CW the Morse code characters are.... Di Da Di Dit, it has a certain rhythm or sound. To many it sounds like "The L with it" or "To He** with it" with the accent on L or He**.
The opposite of CW characters for 'L' is the letter 'F'.... Di Di Da Dit. A way to memorize this letter would be to think of the words.... "I don't know that" with the accent on the word know.
The letters E, I, S and H are numbers of dits in CW, like so E is Dit, I is Di Dit, S is Di Di Dit and H is Di Di Di Dit. P and X are opposites, P = Di Da Da Dit and X = Da Di Di Dah. Y and Q are another pair. B and V are another.
Most letters have these opposites and you can make up your own mnemonics or 'tricks' to remember each word. Longer words are abbreviated and use only simple words. As you become used to hearing different words, some if not all have a certain rhythm in CW and these become familiar as you would hear the spoken word! It is all rote!
Da Da Da Di Dit, Di Di Di Da Dah! or 73! mechanic