For me, it's Andrej Kerpathy and Jay Alammar coz their understanding of concepts and ability to explain is on another level.
But in a very humble fashion thus hard to find.
Also virtually everyone who willingly took their time to post answers or results for everyone to see and benefit from. I'm in awe daily whenever I googl something and usually find my answers from good Samaritans who took that extra time and effort. Whether it's a personal opinion on a restaurant or product to actual answers like in forums and of course stackoverflow.