Starting a Quantitative Finance Notebook

I want this site to become a working notebook for quantitative finance rather than a collection of polished claims.

The main goal is to make ideas testable. When I write about a signal, a backtest, or a risk model, I want to be clear about the data assumptions, evaluation method, and limitations.

Topics I plan to return to include factor models, volatility forecasting, portfolio construction, market data cleaning, and research infrastructure for systematic strategies.