If you're fine with recording, then you want to look towards transcribing apps (I don't have names, but when I looked for one in Play Store a while back, there's a bunch) and use that. You can then use something like wordcounter.io or even google docs to count the words. Source: over 1 year ago

Look at your competitors pages and create a better page - What I mean by this is look at how many words they're using on their page (use wordcounter.io for this, paste it all in), how many images or videos they have on the page, how many times they mention the main keyword and how many outbound links they have. If they're #1, they must be doing something right, so make a note of all this and either match it or go... Source: about 3 years ago

u/Usual_Farm7617 and u/SiriusFoot already posted my favorite YouTube docs, but if you want a wider selection you can check out https://topdocumentaryfilms.com/. It is a collection of free documentaries on a wide variety of topics. Somehow I still like those YouTube channels better, but its a good site to bookmark. Source: about 1 year ago

• Documentaries:(Find mostly on Hulu, Netflix, or Youtube). Fairly comprehensive list can be found here: http://topdocumentaryfilms.com and archive.org. Source: over 1 year ago

I don't have any off the top of my head but check out this site. Source: over 1 year ago

Topdocumentaryfilms.com you can watch the best documentaries here. Source: about 2 years ago

• Documentaries:(Find mostly on Hulu, Netflix, or Youtube). Fairly comprehensive list can be found here: http://topdocumentaryfilms.com and archive.org. Source: over 2 years ago