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Is there content to teach about specific LR tags? I found a blog post defining each tag, but I am still unsure how to go about handling problems with these tags. For example, ElimOpt is my highest priority and I am reviewing questions with these tags to to piece together what it means, but if there is a video/something explaining how to approach ElimOpt problems, that would be helpful!
For 3, doesn't the fact that there are languages from various regions and eras to analyze mean that they exist/were discovered? If not, there wouldn't be anything to analyze. So the existence of these languages from various regions and eras supports that communication has existed across different civilizations over time. I'll agree it's a weak claim, but it seems to me that the premise supports the conclusion.