The DST community is FILLED with hidden gems on YouTube, but they can often be hard to find. Some of them just make one off videos, others have entire channels dedicated to obscure but incredibly useful information. (I'm not talking about channels like EdgyRick)
Creators like Splorange or Helicalpuma are amazing and contribute(d) a lot to the community. So I'll go ahead and post my initial list, and I'd love for others to add some to the list so we can compile a comprehensive list of insightful channels. (Trying to avoid channels like Jazzy or DemonRebuilt, as they are already well known and I don't think provide the same sort of knowledgeable tidbits that the other channels do -- they are great though, nothing against them)
There are a bunch more I know of, but I can't recall them at the moment. Please contribute more to the list, and I will compile them in the main post as time goes on!
Splorange's YouTube - All things DST. This person rocks. I'm sure avid members of the DST community know of her, but nonetheless, they must be mentioned. If you are looking for obscure but insanely useful DST knowledge, this is the place to be.
Helicalpuma's YouTube - Another revered member of the DST community. Unfortunately, he is no longer with us due to his recent passing, but he lives on through the community in many members such as myself from his tutelage. He was an insanely skilled DST player with a wealth of knowledge and strategies for playing the game. Fantastic content creator who must be mentioned.
Guille's YouTube - Skilled DST player whose videos specialize in ruins rushing strategies with different characters. Uploads fairly frequently, and I love watching them to better learn how to rush ruins with certain characters, as I love doing that myself (I look forward to your future Wanda rushes 
@Guille6785)
Pickleplayer's YouTube - A skilled DST modder who seems very dedicated and passionate to the community! They seem to currently be working on a HUGE project that aims to combine Super Smash Bro's with Don't Starve Together. As someone who is obsessed with the SSB franchise, I can say I am really looking forward to this mod. (Credit: @Hornete)