How to deepen theoretical knowledge in the Project management environment?

Question

Agile

Hello.
I started working as an office manager in one small gallery, everything was great, but over time, the work began to get boring and the boss suggested looking for projects. I searched, wrote T / Z and then I realized that PM). I rummaged a little on the Internet and again I realized that I was still oh so far away from the PM. The gallery sank (haha, not because of me), now I very rarely deal with projects. I bought a PMbook, but physically there is no time for it.
Subject: how and where to find a theory concentrate to deepen knowledge?
Help whoever can)

Answer 1

Do not read pmbok without experience, it will be very painful.
https://www.ozon.ru/context/detail/id/2314340/
https://www.ozon.ru/context/detail/id/2409500/
https://www.ozon.ru/context/detail/ id/22433706/
https://www.ozon.ru/context/detail/id/28279054/
Then only experience and PMbok