"It is recommended that the borders of territories in the same bonus overlap, whereas the borders of territories in different bonuses should be adjacent."
How am I to make it like this? I want it, but I don't know how.

set path outline width to 1 pixel for all your territories. if you have problem with overlapping there's an option on the right of the screen that disables it I forgot what it's called. as usual here's the mapmaking discord that you should join: https://discord.gg/RmBqgxzcUg

Okay then. Thanks!