I'm an undergraduate but I find even the titles of the topics in LNCS very unfamiliar as if I have no idea about computer science, I'm wondering if these lecture notes have more info that is not found in textbooks? In other words, is reading text books enough, do textbooks contain the same info but presenting the complete picture? I think a comparison between textbooks vs research papers would answer my questions.
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Keep in mind that by "Lecture Notes in Computer Science", they mean lectures presented at research conferences about new and developing research. They are expressly not notes from class lectures, but rather papers from fairly high level research conferences.
As such, I would expect the "audience" of such papers to be primarily graduate students and higher, with the addition of upper level undergraduates with a particular flair for research. But even then, the content should be challenging, as the content of any research journal should be.