Beneath the layer of ridiculous and hateful words on Facebook, Instagram, or the Youtube comments section, the internet is a goldmine of information.
Specific to the strength and conditioning world, nearly every well-respected coach has a blog, articles, and/or a podcast which presents and exchanges information on training. It's a hell of a resource for up-and-comers like myself.
Below is the list of websites or podcasts that I pay attention to in order to gain new information and insights. I'm always eager to find new sources, so if you think something missing, reply in the comment section below.
Power Athlete Radio - This is by far my favorite strength and conditioning podcast. The founder, John Wellbourne, is an NFL vet who has transitioned into online programming and coaching education. He was the founder of Crossfit Football, which has transitioned to the Power Athlete brand (without the Crossfit connection). They have great guests with interesting conversations centered on empowering coaches and increasing athlete performance.
Westside Barbell - The godfather of Powerlifting, Louie Simmons has published a jaw-dropping amount of articles dating back to 2000. The organization of the articles can be scattered, so you'll have to do some digging if you're looking for something specific. Otherwise, Westside is a goldmine of information from one of the smartest guys in the game.
Dan John - I've referenced Dan John in previous articles. He is clearly a expert in his field, but also ties together a humble and realistic approach to the life/training balance that we all face.
Mountain Tactical Institute - I was privileged to work at Mountain Tactical Institute for nearly two years. Rob Shaul has an impressive amount of articles and original research specific to the Tactical and Mountain Athlete. You won't find much BS there - it's straightforward and to the point information.
Jeff Nichols - Jeff is an exercise physiologist and a retired Navy SEAL. He's plank holder for the NSCA's Tactical Strength and Conditioning facilitator program and does a great job of breaking down the how periodization/progression should work. The Youtube channel is still a bit in the works, but I'd expect to see a lot more of him in the future.
8 Weeks Out - Joel Jamieson works primarily with MMA fighters, but his work and knowledge on conditioning is second to none. Some of his progressions for conditioning rely on tech that isn't readily available for you or me, but the information is gold nonetheless. Quick preview - if you're doing METCON's/HIIT style conditioning only, you're missing out.
Strength Coach - Mike Boyle has worked with professional and collegiate level athletes for as long as I've been out of grade school. He brings a common sense approach to training that pays out for his athletes. Not all articles are written by Mike on this page... he serves as the host for other authors in the strength and conditioning world.
There you have it. I have several websites that I like, but they often are too tied to a particular sport (Oly weightlifting, Boxing, etc.) to be useful for the general purpose performance athlete. Enjoy!