I firmly believe in Federico Ardila-Mantilla’s axioms:
Axiom 1. Mathematical talent is distributed equally among different groups, irrespective of geographic, demographic, and economic boundaries.
Axiom 2. Everyone can have joyful, meaningful, and empowering mathematical experiences.
Axiom 3. Mathematics is a powerful, malleable tool that can be shaped and used differently by various communities to serve their needs.
Axiom 4. Every student deserves to be treated with dignity and respect.
If you’re interested in learning math on your own, like mind maps, but don’t know where to start, I highly recommend giving Learn Anything a look. It is a fully open source search engine, so you can also contribute back to the project. It also has mindmaps for a number of other subjects.
Another great resource for understanding different topics is Khan Academy. It covers a wide range of material from Early Math to Calculus. Their YouTube Channel is also a great help.
If instead you prefer perusing notes that work you through examples give Paul’s Online Math Notes a look!