Choose your system's architecture (usually for most PCs and servers). Choose the ISO Type :

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Choose "Red Hat Enterprise Linux 9" and your architecture (most users require x86_64 , though ARM/aarch64 is also supported).

: You can burn the ISO to a USB drive or attach it to a virtual machine (like VMware or VirtualBox) to begin the installation. How to Set Up a RHEL 9 Virtual Lab for RHCSA Practice