I think blogs are valuable to see other ideas, get inspiration, and to discuss with someone familiar with a topic. Books do not always provide that, as they can be very technical. Considering blogs to be entirely factual and well researched, may not be a great time. My approach when researching or trying to learn something from blogs is to use multiple sources of information and draw conclusions on the quality of what I read.
Also, isn't this post a blog? 😄
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