Whole/half tone and accidentals

Used to indicate silence or pause in music. It is a symbol similar in shape to a note but without a note head, usually a small hollow rectangle or a vertical thin line. The function of a rest is to instruct the performer to stop playing or remain silent at that position without making any sound.

A whole tone and two half tones are at the same distance.

A temporary rise and fall sign is a symbol used to raise or lower the pitch of a note.

As shown in the figure below, a half tone refers to the distance from one key on the keyboard to the next adjacent key, and keys 1 to 2 are half tones because they are adjacent.
As shown in the figure below, a half tone refers to the distance from one key on the keyboard to the next adjacent key, and keys 1 to 2 are half tones because they are adjacent.
As shown in the figure below, a half tone refers to the distance from one key on the keyboard to the next adjacent key, and keys 1 to 2 are half tones because they are adjacent.
As shown in the figure below, a half tone refers to the distance from one key on the keyboard to the next adjacent key, and keys 1 to 2 are half tones because they are adjacent.
Let us take a look at the bond between C and D in the figure below
This sound is C #, which is half a level higher than C.
It is also known as Db because it is half a tone level lower than D.
Looking at E and F below, E can also be called Fb, which is half a tone level lower than F.
Similarly, F can also be called E #, and when a sound has multiple names, it is called an equal sound sound name.
Below are the double descending and double ascending signs. The ascending and descending signs change a note by half a scale, while the double descending and double ascending signs change a note by one whole tone.
The pitch of D and Ebb is the same, because E reaches D from the next whole tone
D and Cx are also the same, because they are both one whole tone higher than C.