References — bi-06 Chromium C++ for Frontend Engineers

Primary sources first. In-tree Chromium docs beat any external source, including these modules.

Chromium's dialect

Chromium C++ style guide — start here; it defines the subset actually used.
C++ features allowed in Chromium — which standard-library and language features are permitted, and why several are not.
Blink renderer README — Blink's additional conventions.

The types you will meet constantly

base:: library overview
Callbacks and bind — base::OnceCallback, base::BindOnce, and why they are not std::function
Smart pointer guidelines — std::unique_ptr, scoped_refptr, and Blink's Member<>/Persistent<> from bi-04
base::WeakPtr — the pattern for callbacks that must not resurrect a dead object

Background C++ (if the language itself is new)

cppreference.com — the reference to use; avoid tutorial sites for this.
C++ Core Guidelines — note where Chromium deliberately diverges.

bi-01 — Navigating Chromium — finding the code you are now able to read
bi-05 — Bindings — the densest C++ in the tree
bi-14 — Contributing — where reading becomes writing

When a claim here proves stale, record it in PROGRESS.md section 7.