Imposter syndrome.
A question guys, I'm a web dev since 2012, started with php, then shifted to frontend, for 3 years my main was PHP and basic HTML CSS, in 2017 I shifted to / did courses on vuejs, angular and react (loved angular the most) also laravel. Have also dabbled a bit in python, for crawling and mining. The problem is I've never worked with a team or for a full fledged Dev company, so I'm unsure as to how to judge my growth and whether I'm moving in the right direction. I feel like I need a lot better understanding of Linux usage and server control, or should I learn nativescript etc.

What do you suggest? Should I simply look for a mentorship program, if yes any clue where?

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