It seems like you're asking about musical notation and instructions for playing a piece on an instrument. Here's a breakdown of the concepts you mentioned:
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Notes to Play at Once: This refers to chords or multiple notes played simultaneously. The number of notes can vary depending on the harmony required by the piece.
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Duration of Each Note: How long each note should be held is indicated by the note value (e.g., whole notes, half notes, quarter notes). Additional symbols like dots or ties may also indicate how to extend note duration.
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Dynamics (How Soft to Play): This indicates the volume at which to play. Terms such as "piano" (soft), "forte" (loud), or dynamic marks like "p" (piano) or "f" (forte) help convey this. There might also be indications for gradual changes in dynamics, such as "crescendo" (getting louder) or "diminuendo" (getting softer).
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Harmony in the Right Hand: If you're playing a keyboard instrument (like a piano), the right hand is often responsible for playing the melody and any harmonic chords that accompany it. The specific notes or chords for the right hand may be notated above the staff or indicated through chord symbols (like C, G7, F, etc.).
If you have a specific piece of music in mind or a particular question about how to interpret musical notation, feel free to share!