No worries. Everyone here started small
edge and vendor are Armbian terms for kernel branches just like current.
You guessed correct, edge is bleeding edge and usually follows latest mainline kernel (6.14.y today).
vendor is based on Rockchip BSP kernel which is 6.1.y at the moment. While a bit out of date most hw functions work here.
current usually follows latest available LTS mainline kernel.
As you're a beginner and most likely just want things to work I suggest to try a vendor kernel based image first.
mido_00 reacted to Werner in Available frequencies for RK3588 are wrong