Also, I have been watching some of Paul Sellers' videos and I noticed people mentioning him, what are some thoughts on him. He seems to me to really know his stuff (but what do I know at this point)
My thoughts on him are mixed.
On the good side, he knows his stuff. While I've heard other sources disagree with him, it's generally in a "that's not the way I do it, but it works" sort of way. He's a good public speaker, and I like the fact that he's making an effort to teach what he knows. I've seen some of his finished furniture, and a lot of it is very nice. His book is well written, and I found a lot of it quite useful; his videos, likewise, are reasonably well produced and frequently quite useful.
On the bad side, he's opinionated, absolutist, and occasionally arrogant. He sometimes approaches things from the viewpoint of "this is the way I do it, so it's right by definition", and I dislike that. His blog, in particular, falls prey to this; he's a little more balanced in person. In his writing, especially, he's very dismissive of power tools, taking the view that if you build things with power tools you're a machinist, not a woodworker, and the tone of his writing makes it sound like he's equating "machinist" with "slime". Again, in person, he's much more balanced, and he's admitted that he has power tools for things like ripping long stock, but he still has a very strong streak of "power tools bad, hand tools good."
I think that on balance he's worth watching and listening to, but only with the caveat that you should remember his biases. The same goes for any of the other hand tool heroes: Christopher Schwartz, Adam Cherubini, Jim Tolpin, they all have their biases. So do I, and probably so do you. Just take those into account when reading their books or watching their videos or live presentations.