Don't underestimate a branch, each branch contains several courses! For example, the topology includes:
1, point set topology
2. Algebraic topology
3. Homotopy theory
4, low-dimensional topology
5. Homology theory
6. Dimension theory
7. Topology on a Lattice
8. Fiber bundle theory
9. Geometric topology
10, singularity theory
1 1, differential topology
12, other disciplines of topology
I think I asked my teacher, who specializes in fuzzy mathematics, and I feel very powerful!
You can ask questions and forget to adopt them!