【AnayaSoft】E-book [Introduction to NES Game Making].

E-book (PDF file)[Introduction to NES Game Making].
This is an introduction to making your own NES games. You can make not only software but also hardware (NES cassette board) by yourself.

If you have a Windows 10 (64bit) PC, you can develop the software part with Notepad and command prompt (certutil command) which are included by default.
This is also a good introduction to hand-assembly.