Hi, first, big thanks for your tutorial. It really helps to understand bitbakes basics. I found some typo, I report them here :
§4.2.1 : The [word missing : files] are located ...
§5.2 We make now use of the variable previously
§6.1 EXPORT_FUNCTIONS makes..
§6.4 Build one recipe
§7.3 To set a layer’s priority,
§9.1.2 Access the variable in a bash like syntax.