No VPS, no database, no CMS bill. This site is a git repo that compiles to static files — search index, social cards, and fonts included — and Cloudflare Pages serves it for free. Here's the whole pipeline, with the actual configs.
A flame graph turns thousands of stack samples into one picture where width is time and the widest boxes are your problem. How sampling profilers work, how to read the graph in ten seconds, and the traps — inlining, wait time, broken stacks — that mislead beginners.
Git feels like a pile of special commands until you see the data model underneath: four object types in a key-value store keyed by hash. Learn the model and every confusing command suddenly makes sense.