https://www.warzone.com/Map/30404-Biomes-AmericasThe bonuses on this map are crafted in a way that controlling 1, 2, 3, 4 or 5 territories in a bonus will grant different income. You can use the bonus table on the map to tell how much income you will gain or lose for controlling a certain amount of territories in a bonus. Be aware that there are a total of 12 biomes, each with its individual color and income distribution. Bonuses can contain 3,4 or 5 territories in them and accordingly give varying income.
Table gives how much armies the territories will give. What exactly you didn't understand?
i don't have videos, but can give some games examples:https://www.warzone.com/MultiPlayer/Tournament?ID=24427
this is team game, but you can see the games to understand how to get bonuses.