Hardening SSH on a fresh Linux server
Disable root login, enforce key-based auth and lock down the basics in ten minutes.
Topics
Understanding subnetting without the headache
A practical, no-nonsense walkthrough of CIDR notation and how to carve up a /24.
A pragmatic guide to password hashing
Why bcrypt and argon2 beat SHA-256, and how to use them correctly in your app.
Right-sizing your first cloud workload
Stop over-provisioning. Match instance types to real metrics and cut your bill.
Writing shell scripts you will not regret
set -euo pipefail, quoting, and the handful of habits that prevent 3am surprises.