Guide to music symbols:

Breath mark: In case you forget to breathe
Accelerando/Ritardando: You should probably stop looking at the paper
Solo: You were never informed of this
Soli: Like a solo, but everyone gets credit
8 measure rest: You're unimportant
>16 measure rest: You're very unimportant
Measure repeat: At least you're playing
Coda: So you go back and then - wait...
Grand pause: Stop playing. Contemplate. Keep playing.
Double bar line: Just...stop

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(see "how to read sheet music" by Julian Cianciolo on YouTube)