Tutorial on using OpenWrt build system

I've managed to create an OpenWrt Build System on FreeBSD, and now I'd like to see if it's usable, but the menu which comes up is pretty daunting. Is there such a thing as a tutorial to show how to use it?
I'd like to try and build a PC version of OpenWrt to start with just to get comfortable with how it works.
Any guidance would be much appreciated.

cat << EOF > .config
CONFIG_TARGET_x86=y
CONFIG_TARGET_x86_64=y
CONFIG_TARGET_x86_64_DEVICE_generic=y
EOF
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