Hey there! Today's lesson is all about summarizing, so I'll keep this intro short.
つまり is an adverb derived from the verb 詰まる ("to be packed; to shorten"). It's used to express "That is to say.../In other words.../In short..." (although many other translations are possible).
The essential pattern is that we place つまり at the start of a sentence or clause, and then provide a summary or "the gist" of something that was previously mentioned. Usually, つまり refers to the information directly before it, like so:
1.1a
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