Linux Insides
I am only at the first page, but already I must recommend this work<p><a href="https://0xax.gitbooks.io/linux-insides/content/" rel="nofollow">https://0xax.gitbooks.io/linux-insides/content/</a><p>as unmissable, and "I should have read this as a child" - that is, for those who feel a lack of solid ground until they know exactly what makes the machine work.