The ins and outs
Meaning: all the details and facts about something, all info about
Example: He knows the ins and outs of this business. Tolya is someone who knows the ins and outs of the music industry.
Π‘Π΅ΡΠΈΠ°Π»Ρ ΠΈ ΡΠΈΠ»ΡΠΌΡ Π½Π° Π°Π½Π³Π»ΠΈΠΉΡΠΊΠΎΠΌ Ρ ΡΡΠ±ΡΠΈΡΡΠ°ΠΌΠΈ. +1 ΠΠ΅ΡΡΡ Π² ΠΏΠΎΠ΄Π°ΡΠΎΠΊ π
Example: He knows the ins and outs of this business. Tolya is someone who knows the ins and outs of the music industry.