"sim." is the abbreviation of "simile", which means "same as before". For example, if there is a section of notes that always skip notes, for the convenience of notation, you can only write skip marks at the first few notes, and then write "sim." or "simile" at the end, which means that the following notes All the strings are skipped.

"Dim." is the abbreviation of "diminuendo", which means "fading".

"molto" is an adverb of degree, meaning "very" or "very".

"rit." is the abbreviation of "ritardando" and "ritenuto", both of which mean "gradually slowly".

"molto rit." means "the speed drops very low quickly".

The speed of Andante is approximately 66 beats per minute.

If there is anything you don’t understand, you can ask me again. :)

Music and Composition Technology (Team)-Sphalerite