The blog is a worse source than the first one. Blogs are very, very rarely not clouded by a personal bias and the same is true of Youtube videos. Actually, if you want sources that can be taken seriously Youtuve videos are a bad place to go and the comment section is literally the last place to look.
Look for news articles (preferably not Left wing propaganda papers or the conservative dominated media), scholarly articles (try Google Scholar), books/eBooks and surveys conducted by government agencies and independent research organisations. Those will be the best sources you'll find. The sources list at the bottom of wikipedia articles can be useful too.