How to install Nginx from source on RHEL-family Linux: build tools, download and verify the source, configure modules, compile and run with systemd.
How to install Nginx on CentOS Stream, Rocky Linux and AlmaLinux: install the package, open the firewall, manage the service and add server blocks.
How to set up an SSL certificate for Nginx: free Let's Encrypt certificates with Certbot, self-signed certificates with OpenSSL, and a secure TLS config.
Free Linux quiz: test your Linux basics, commands, permissions, users and groups with two short multiple-choice quizzes and instant scores.
What LVM is, its building blocks (PV, VG, LV), how to create an LVM partition step by step, mount it permanently, extend it online and take snapshots.
What swap is on Linux, how much you need, how to create a swap partition or swap file step by step, make it permanent, tune swappiness and when to use zram.
What a disk partition in Linux is, MBR vs GPT, primary, extended and logical partitions, and how to create, format and mount one with parted or fdisk.
Linux user and group management explained: user types, key files, creating, changing, locking and deleting users, groups, sudo access and best practices.
Linux special permissions explained: SUID, SGID and the sticky bit with examples, their security risks, and how to use ACLs with setfacl and getfacl.
Linux file permissions explained: read, write and execute for owner, group and others, directory permissions, chmod modes, chown and umask.
