How to learn linux advanced

Hi I am new to LQ and using linux since 1 month, now I perfectly settled in linux environment and learned many things, I use manjaro xfce for daily use and I know basic commands like for installing or removing softwares or directories, etc. But now I want to learn command line properly and also to become a Linux geek. So please give me a step by step guide to achieve that and from where I could learn this.