just skimming through bookmarked youtube guys .. not necessarily in order of quality
mike's electric stuff
https://www.youtube.com/channel/UCcs0ZkP_as4PpHDhFcmCHyAloads of good videos , interesting videos, some high voltage stuff, some on the weirder side (x-ray, plane black box,defibrillators for example)
the signal path
https://www.youtube.com/user/TheSignalPathBlog/videosvery nice and long videos on various subjects
mjlorton
https://www.youtube.com/channel/UCOTPsWDzNAosVd6vc3pCPHQgood multimeter reviews, some electronics basics tutorials lessons good quality, good stuff.
norcal715
https://www.youtube.com/user/norcal715/videoslots of good hardware repairs with very good explanations and details monitors, tvs, receivers etc etc
https://www.youtube.com/user/rolinychupetin/videos?view=0&flow=gridi think he's a teacher. A LOT of lessons electronics related, basics, theory, opamps etc .. also a series of videos in spanish
bigclivedotcom
https://www.youtube.com/user/bigclivedotcom/videossome led lamps teardowns reviews etc
charbax
https://www.youtube.com/user/Charbax/videoshuge amount of videos ... dude goes through hong kong korea japan etc and visits laptop/tablet/phone factories and showrooms and presentations kinda noob on the actual hardware knowledge but the actual videos are good
https://www.youtube.com/user/Maxxarcade/videoshuge amount of repairs of audio amplifier and other hardware , computer fixes, monitors repairs, building computers etc etc
Connor Wolf
https://www.youtube.com/user/Fake0Name/videosalready said.. lots of reviews.
jjoster
https://www.youtube.com/user/jjoster/videossome arduino stuff, dude is designing his own projects and goes through them
https://www.youtube.com/user/anajonesr/videosquite good arduino tutorials/lessons ... found the presentation easy to follow & understand even for a total beginner at microcontrollers (atmega/arduino)
also has a whole bunch of cnc/pick and place machine stuff
https://www.youtube.com/user/AndyDaviesByTheSea/videosGood videos about making radios, making capacitors from basic elements, radio related stuff , quite a lot to learn if there's time to watch the videos and you're fascinated by the subject
electronupdate
https://www.youtube.com/user/electronupdate/videossome multimeter reviews, lots of led lamps reviews most of them with teardowns and explanations about how they work
GrantsPassTVRepairs
https://www.youtube.com/user/GrantsPassTVRepairs/videossome hardware repairs (monitors, tvs, etc) though not sure how much you'd learn from it, it's kinda light on actual explanations and details.
https://www.youtube.com/user/tesla500/videoslots of teardowns with some explanations , some repairs
https://www.youtube.com/user/uxwbill/videosA huge amount of videos on various things, recovering old computers from recycling centers or pawn shops and fixing them, other things like monitors, teardowns, presentations of old hardware, light on actual fixing details (like board faulty because part x that does y is bad and this is how i found out)
w2aew
https://www.youtube.com/channel/UCiqd3GLTluk2s_IBt7p_LjAvery good lessons/tutorials , lessons on oscilloscopes, probes, some circuits to use in connection with oscilloscopes etc
human hard drive
https://www.youtube.com/user/humanHardDrive/videos?flow=grid&view=1lots of stuff, arduino, stm32, raspberry pi, basic electronics, opamps etc personally i don't quite like the style of the videos (drawing with mouse on virtual notepad on screen while explaining) but it may be just me.
https://www.youtube.com/channel/UCT5e-XjqHPfA3_9wF3CgY1wpaceworldwide posted a series of videos that are a bit outdated but very good soldering, pcb repair etc (everyone should watch the soldering lessons imho)
IanScottJohnston
https://www.youtube.com/user/IanScottJohnston/videosa few repairs, a few reviews, a series about designing a power supply and some other stuff
jersagfast
https://www.youtube.com/user/jersagfast/videosvarious electronics stuff .. on breadboards, some hardware reviews, home automation, solar stuff
https://www.youtube.com/user/drjcircuits/videos?flow=grid&view=0circuits analysis and design
PhirePhly2007
https://www.youtube.com/user/PhirePhly2007/videosvarious electronics projects breadboard stuff
https://www.youtube.com/user/kev31779/videosfm/cb etc radio repairs and others
https://www.youtube.com/user/kdarrah1234/videosmicrocontroller basics , some simple breadboard projects and lessons about shift registers, rgb cubes, leds etc etc
https://www.youtube.com/user/avionicsttc/videosavionics grade soldering lessons and some other lessons
https://www.youtube.com/user/rpcelectronics/videoseagle tutorials , other electronics stuff.
https://www.youtube.com/user/toddrharrison/videossome multimeter reviews, some lightbulbs, some teardowns
https://www.youtube.com/user/vk3ye/videosfm/ cb radio stuff
https://www.youtube.com/user/vwestlife/videosshowing of older hardware mainly radio/cd/cassette players , mini reviews,
https://www.youtube.com/user/nptelhrd/videossome university dumping all their courses, presentation, lessons etc on youtube. a big part of them are electronics/electrical/telecommunication related may be hard to understand the indian accents.
etc etc
maybe people will bother searching for some terms in the future and find this thread and this post in the future.