https://kuing.cjhb.site is a math forum

https://blog.cjhb.site is a math blog

Equations are in LaTeX or MathML format. One can be converted to the other by https://pandoc.org/try/
🗨️LaTeX is easier to type since there are high-level commands.
🗨️MathML can be parsed by Math-aware search engines like https://approach0.xyz/search/ but it is more verbose

The diagrams are generated in two ways: QuickLaTeX or MathJax SVG.
🗨️For QuickLaTeX, it converts TeX file to inline SVG using https://github.com/hbghlyj/jekyll-quicklatex
  It makes the output file size bigger but is authentic LaTeX.
  The diagram will be produced in TeX format, e.g. by TikZ, so it cannot be edited visually but it can use high-level commands.
🗨️For MathJax SVG, it embeds formula into SVG using a custom MathJax config https://github.com/hbghlyj/hbghlyj/blob/main/_includes/markdown-enhancements/mathjax.html (the point is to output SVG directly, instead of wrapping in mathjax typesetroot element).
  The diagram will be visually editable in Inkscape, but it may not be as high-level as TikZ, so more verbose.