Hey Yossi, Kind of feel you've posted this into the wrong space, as basic music theory, or any tonegym stock courses require any of the game to be played.
When posting from your Feed Dashboard, make sure to select the correct space in the drop down selector right next to the post button.

I'll still try and help you as much as I can ^^
if you want to contact ToneGYM staff, https://www.tonegym.co/support/index there you can do it.
ToneDEAR staff, I can't tell you, I assume this is your educational mentor that that you are a student of. If so you probably already joined the right space, now you just have select that you want to post in there, or click on the logo in the top menu, al the way to the left. this displays all your currently joined spaces and should lead you to the ToneDear pals, if you joined it already- I not try looking for some instructions maybe in your confirmation email.

For number 2, Rhythmania will show you a 2 Bars long Notation, Notes are rhythmical hits, not changing pitch, only duration. otherwise, the notes body would be round.

Giving you 1 full Bar of headroom to focus and adopt the tempo, the cursor moves along the blank squares above the Treble clave notation in realtime playing a metronome to emphasize the tempo as each square represents a quarter section of the bars writtin below that. The Blank squares always are 1 full bar (3 sqaures at 3/4, 4 at 4/4 signature) of light sqares over 2 bars (6 for 3/4. 8 for 4/4 etc). The ligher sqaure is the headroom counting you in when you start a round, Everything that is written in the Treble clave is then to be played while the curser indication proceeds and reaches the darker sqaures. the metronom will continue to play telling you where you're at in time.
You just have to follow the notation hitting spacebar whenever a not is presumably played according to what you read in those notes.
At the end when 2 bars in messure are completed in time, the game will tell you if you hit spacebar lesser times than what is notated, it will say insufficient taps.- It'll say too many taps if, well you hit more often than written down. in between those poles lies the, what I call realm of accuracy I play the amount of notes, regardless of when they had to be played, just as long as the amount is the same the game will prompt you not only with inaccurate but also with 2rows of dots, that show up in those blank squares. one line being white showing when every note was supposed to be played, when you should've pressed spacebar. the second row represents your actual hits a nd will have either green dots for when a hit got approved to be played at the right time or a red one indicating that the timing of that hit was not close enough to when a hit should've been played.

you can't make it exactly on point always and up until level 35 i can confirm the variation tolerance for the timing is quite forgiving.

Thank you very much for your detailed answer

Also, if you're using bluetooth headphones it will through you all out of whack on the the rhythm games. The delay between what you hear and it getting broadcasted to your headphones causes you to come in late. There is some mechanic for adjusting the delay, but I've found that really you just need to either use wired headphones or wired speakers. Just in case maybe that helps.