start with step chord recording.
this very is easy to do, and gives instant correlation - because the notes are written at the top of the keyboard. Just change 3 chords in rotation (C, F, G say) with the left hand and enter the measure values at the top of the keyboard with a 'ping' for each chord.
Watch the cursor jump, and play back the result and you soon see the effect of crotchet, quaver, dotted note etc. Easier for the beginner to think American with quarter note, eighth note etc. Slow the tempo and watch the beat leds to see the results.
Then move on to step record in the sequencer menu, and see how the asterisk jumps as you dial up various note lengths and rests. Here you can listen to the result of triplets, which may not fit the asterisk spaces in all circumstances in the display, but playback accurately. To input a dotted note use the + function to add another half (or quarter etc value).
Best of all, get a pc sequencer with notation screen, or a score writer. Seeing the score appear as you play is better than any theory book just to get you started...
This is how I learnt, never had a proper lesson in my life, apart from school - where I hated music lessons!