I haven't taken a formal topology course yet, but I'd like to start self-learning, as I've always been curious about it. I was looking for an actual textbook, along with a smaller companion book, like one of those Schaum's Outlines. I heard great things about the Munkres Topology textbook, but would like the opinions of you all first before dropping $100 on it.
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As an introductory book, "Topology without tears" by S. Morris. You can download PDF for free, but you might need to obtain a key to read the file from the author. [He wants to make sure it will be used for self-studying.]
Note: The version of the book at the link given above is not printable. Here is the link to the printable version but you will need to get the password from the author by following the instructions he has provided here.
Also, another great introductory book is Munkres, Topology.
On graduate level [non-introductory books] are Kelley and Dugunji [or Dugundji?].
Munkres said when he started writing his Topology, there wasn't anything accessible on undergrad level, and both Kelley and Dugunji wasn't really undergrad books. He wanted to write something any undergrad student with an appropriate background [like the first 6-7 chapters of Rudin's Principles of Analysis] can read. He also wanted to focus on Topological spaces and deal with metric spaces mostly from the perspective "whether topological space is metrizable". That's the first half of the book. The second part is a nice introduction to Algebraic Topology. Again, quoting Munkres, at the time he was writing the book he knew very little of Algebraic Topology, his speciality was General [point-set] topology. So, he was writing that second half as he was learning some basics of algebraic topology. So, as he said, "think of this second half as an attempt by someone with general topology background, to explore the Algebraic Topology.