Jeeeebus the atlas tree lmao.
This shit is actually worse than the skill tree as i have no idea what the hell is it i'm looking at, though at least respec points are cheaper.
It's very easy.
Pick what content you want to farm end game (Expeditions, Essences, Legion etc.) and just spec into them. That's it. I'd recomment two mechanics with maybe an additional third as a bonus. For example, this league I'm farming expedition logbooks and essences, followed by short delirium. For altars I choose exarch.
The normal skill tree is easy too, you essentially pick the skills you want to have in your build and then use the highways to get to them, that's it. If a skill is really far from your highway, you can put a skill onto an amulet with oil.