I have just started reading Wittgenstein's Tractatus Logico-Philosophicus and at the start I already don't understand his claim. He said that the world is the totality of facts and not of things.
I am totally clueless what he means by that and it would be nice if someone explained it to me.
Are these and other concepts in his work precisely defined or are they just intuitions about the world?
If the former is true then I don't understand why he started using a concept without defining it.
If the latter is true then shouldn't we take his work's relevance only as historical which makes reading it merely getting a lecture in the history of philosophy?
Or are these concepts so complex that trying to define them would be counter-productive from the viewpoint of the work? Or is the whole text about getting an intuition about these concepts?
So basically my question is what are the differences between facts and things either in terms of definition or intuition?