It's handy to have an external, bootable macOS Ventura installer, but you practically have to fight Apple to make one. Here's what you have to do. In Apple's ideal world, you let your Mac update ...

macOS Monterey version 12 is a stable, lightweight upgrade that works great on older Macs, and you can use the direct DMG or ISO links to download, install, upgrade, or downgrade your system easily.