You have not landed on something nobody understands
It is worth knowing early that this is one of the most heavily studied conditions in medicine, and that the treatments have been tested against each other rather than merely asserted.
What the research says
Cuijpers P, Miguel C, Harrer M, Plessen CY, Ciharova M, Ebert D, Karyotaki E (2023). Cognitive behavior therapy vs. control conditions, other psychotherapies, pharmacotherapies and combined treatment for depression: a comprehensive meta-analysis including 409 trials with 52,702 patients. World Psychiatry, 22(1), 105 to 115 doi
409 randomised trials covering 52,702 people, pooling talking therapy against no treatment, against other therapies, against medication, and against the two combined. It is the largest synthesis available on the question. It supports treatment being worth seeking. It does not settle which treatment suits which person, and that part is worked out with a clinician rather than read off a paper.