You can likely get a lot out of Youtube, but there may be problems with deciding what's actually relevant to you from the firehose. I highly recommend the videos from Lawrence Systems and Willie Howe, Louis Rossmann is entertaining (but likely not covering anything that you should consider getting into). Electronics can be entertaining but likely not relevant to what you're going to deal with. The Podnutz weekly Computer Repair Podcast show on Sunday afternoons is likely worthwhile for you to listen to and go into the archives on (that's live and you can get into the IRC chat, it's released as a podcast episode on Thursdays). Youtube will be particularly useful for repair of particular systems (or for letting you look at a video and say "no chance I'm going through
that for a $100 repair.").
Online training like Pluralsight, Lynda/LinkedIn Learning, etc. might have useful materials for understanding how a lot of things work, building from what you know now. They may be less useful for the practical day-to-day stuff, but understanding at least the basics of how the systems you're working on work is unlikely to be a bad thing.
Conference-wise there's the
TechCon Unplugged conference in late September which is supposed to be fairly technically-oriented I believe and if I can swing it I'll be going to that; there's also
ITOCompass in Chicago April 25-28 which I'm also planning to go to. My feeling is that both of those are descended from the 2016 and 2017 Unconventions (run in part by folks from right here, IIRC). ITOCompass was somewhat intended to be a 2018 continuation of those (or maybe just marketed as such) but was heavy on marketing/business consultants who would be happy to sign you up as a client and that turned off a lot of folks (I missed the second day due to a family health crisis, but I think it was supposed to be better and more technical). I'm pretty sure a bunch of the TechCon Unplugged folks are ones who were disappointed by ITOCompass last year and are trying to get back to the Unconvention feel.
I do have hopes for this year's ITOCompass, particularly with Karl Palachuk keynoting since I just this month incorporated for possibly spinning off on my own. Since it's happening less than an hour drive from me it's not like I have to justify thousands in travel expenses. (I may even get a chance to use some gift cards for a couple expensive steak places down there since I'm usually not in Chicago in the evenings).