How to become proficient at password cracking?

[pumba]

Hi, I'm new to password cracking and I'd like to know how to be become better in the field, where should I start from? I already used hashcat to recover passwords but those were very simple, I could do that with dictionary attack and very primitive mask attack when a mask was only 6-10 numbers. Dictionaries were not made by me and they are in public access.