like

Usefull pages to often come back to.

ywstd.fr - "Ypnose's enclave"

Creator of wswsh, ahrf and other nice and useful stuff, who has been very helpful. Loves simple and suckless software. [1]

decentsecurity.com - "Start somewhere. Start here."

Entry level guides to security.
Pass by to get started or to keep up with the latest essentials.
Also has an enterprise level section. [2]

bolthole.com - "bolt-hole: a place of escape or refuge"

Collection of guides to get into programming and other stuff.
The tutorials for AWK and KSH helped me a lot. [3]

intux.de

Frank helped me debugging my suggested installation of Prosody on Uberspace.
He blogs about Linux and OSS on Desktops, Servers and RPis and also other stuff. [4]