Please help me.
Can you give me the all usefull link to understand how the kernel works.
I am 62. I would like to be evangilist of linux in Africa.
I have no money to buy books or courses.
I'm sure people here will have more resources to recommend.
That said, the Linux Kernel is huge. Currently at over 15 million lines of code. If you tell us which specific areas are of your interest, we can give you more pinpointed recommendations.
Enjoy! It is a long path of learning but a fun and gratifying one.