diff --git a/InternalDocs/README.md b/InternalDocs/README.md
index 2ef6e653ac19d4..68cb3d909cf8f1 100644
--- a/InternalDocs/README.md
+++ b/InternalDocs/README.md
@@ -11,8 +11,9 @@ The core dev team attempts to keep this documentation up to date. If
 it is not, please report that through the
 [issue tracker](https://github.com/python/cpython/issues).
 
+- [Structure of the CPython Repository](repo_structure.md)
 
-Compiling Python Source Code
+Compilation
 ---
 
 - [Guide to the parser](parser.md)
@@ -42,3 +43,7 @@ Program Execution
 - [Garbage Collector Design](garbage_collector.md)
 
 - [Exception Handling](exception_handling.md)
+
+---
+
+- [External Resources](external_resources.md)
diff --git a/InternalDocs/external_resources.md b/InternalDocs/external_resources.md
new file mode 100644
index 00000000000000..79592f41cac418
--- /dev/null
+++ b/InternalDocs/external_resources.md
@@ -0,0 +1,20 @@
+
+# External Resources About CPython
+
+The CPython code base is constantly changing and evolving.
+Below are references to external resources about CPython's architecture aimed at
+building your understanding of CPython internals and its evolution:
+
+
+| Title | Brief | Author | Version |
+| --- | --- | --- | --- |
+| [`A guide from parser to objects, observed using GDB`](https://hackmd.io/s/ByMHBMjFe) | Code walk from Parser, AST, Sym Table and Objects | Louie Lu | 3.7.a0 |
+| [`Green Tree Snakes`](https://greentreesnakes.readthedocs.io/en/latest/) | The missing Python AST docs | Thomas Kluyver | 3.6 |
+| [`Yet another guided tour of CPython`](https://paper.dropbox.com/doc/Yet-another-guided-tour-of-CPython-XY7KgFGn88zMNivGJ4Jzv) | A guide for how CPython REPL works | Guido van Rossum | 3.5 |
+| [`Python Asynchronous I/O Walkthrough`](https://www.youtube.com/playlist?list=PLpEcQSRWP2IjVRlTUptdD05kG-UkJynQT) | How CPython async I/O, generator and coroutine works | Philip Guo | 3.5 |
+| [`Coding Patterns for Python Extensions`](https://pythonextensionpatterns.readthedocs.io/en/latest/) | Reliable patterns of coding Python Extensions in C | Paul Ross | 3.9+ |
+| [`Your Guide to the CPython Source Code`](https://realpython.com/cpython-source-code-guide/) | Your Guide to the CPython Source Code | Anthony Shaw | 3.8 |
+| [`Python's Innards Series`](https://tech.blog.aknin.name/category/my-projects/pythons-innards/) | ceval, objects, pystate and miscellaneous topics | Yaniv Aknin | 3.1 |
+| [`Eli Bendersky's Python Internals`](https://eli.thegreenplace.net/tag/python-internals) | Objects, Symbol tables and miscellaneous topics | Eli Bendersky | 3.x |
+| [`A guide from parser to objects, observed using Eclipse`](https://docs.google.com/document/d/1nzNN1jeNCC_bg1LADCvtTuGKvcyMskV1w8Ad2iLlwoI/) | Code walk from Parser, AST, Sym Table and Objects | Prashanth Raghu | 2.7.12 |
+| [`CPython internals: A ten-hour codewalk through the Python interpreter source code`](https://www.youtube.com/playlist?list=PLzV58Zm8FuBL6OAv1Yu6AwXZrnsFbbR0S) | Code walk from source code to generators | Philip Guo | 2.7.8 |
diff --git a/InternalDocs/repo_structure.md b/InternalDocs/repo_structure.md
new file mode 100644
index 00000000000000..1b686162c292b7
--- /dev/null
+++ b/InternalDocs/repo_structure.md
@@ -0,0 +1,49 @@
+
+# The CPython Repository
+
+This section gives an overview of CPython's code structure and provides
+a summary of file locations for modules and built-ins.
+
+Source code layout
+==================
+
+The core interpreter implementation is in the [`Python/`](../Python) directory.
+Some of the files there are generated during the build process, that will be
+indicated by a comment at the top of the file.
+
+For a Python [`module`](https://docs.python.org/3/glossary.html#term-module),
+the typical layout is:
+
+* `Lib/{<module>}.py`
+* `Modules/_{<module>}.c` (if there's also a C accelerator module)
+* `Lib/test/test_{<module>}.py`
+* `Doc/library/{<module>}.rst`
+
+For an [`extension module`](https://docs.python.org/3/glossary.html#term-extension-module),
+the typical layout is:
+
+* `Modules/{<module>}module.c`
+* `Lib/test/test_{<module>}.py`
+* `Doc/library/{<module>}.rst`
+
+For [`bltin-types`](https://docs.python.org/3/library/stdtypes.html#bltin-types),
+the typical layout is:
+
+* `Objects/{<builtin>}object.c`
+* `Lib/test/test_{<builtin>}.py`
+* [`Doc/library/stdtypes.rst`](../Doc/library/stdtypes.rst)
+
+For [`built-in-funcs`](https://docs.python.org/3/library/functions.html#built-in-funcs),
+the typical layout is:
+
+* [`Python/bltinmodule.c`](../Python/bltinmodule.c)
+* [`Lib/test/test_builtin.py`](../Lib/test/test_builtin.py)
+* [`Doc/library/functions.rst`](../Doc/library/functions.rst)
+
+Some exceptions to these layouts are:
+
+* built-in type ``int`` is at [`Objects/longobject.c`](../Objects/longobject.c)
+* built-in type ``str`` is at [`Objects/unicodeobject.c`](../Objects/unicodeobject.c)
+* built-in module ``sys`` is at [`Python/sysmodule.c`](../Python/sysmodule.c)
+* built-in module ``marshal`` is at [`Python/marshal.c`](../Python/marshal.c)
+* Windows-only module ``winreg`` is at [`PC/winreg.c`](../PC/winreg.c)