I'm a big fan of topology and algebra. I'm also a huge fan of thinking about how to better teach mathematics. Recently, I've begun thinking about ways to better draw and visualize topics in algebra and topology.
I host a math blog which attempts to cover a few "higher level" and some lower-level topics in a long, detailed manner. One reviewer noted: "It's the opposite of elegant."
Q&A for people studying math at any level and professionals in related fields
Q&A for people who want to be financially literate
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Q&A for users of Mathematica
Q&A for professional and enthusiast programmers
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for professional programmers interested in conceptual questions about software development
Q&A for musicians, students, and enthusiasts
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field