This build is straightforward in that it goes all in on Lightning Damage/Shock and the corresponding Bow Skill.
Lightning Arrow + Lightning Rod
Lightning Arrow + Lightning Rod
These two are your bread and butter. Lightning Arrow (LA) will Chain Lightning on hitting an enemy/terrain, and Lightning Rod (LR) gives LA another target to Chain to.
When the Rod is chained to, the Rod will also deal a burst of Lightning damage in a small AoE around it.
Chain is an optional Support Gem for Lightning Arrow. I've played around with and without it, and for the most part, performance seems about the same. (When replacing Chain with a Damage Support Gem)
It's arguably comfier to play when Lightning Arrow deals more damage (without Chain) so you don't have to rely on Lightning Rod placement to carry your damage.
But it's quite satisfying to hear Lightning Arrow chain a million times across the Rods.
Herald of Thunder
Herald of Thunder
Heralds will improve your clear speed tremendously, helping clear stragglers and deal more damage. In the Endgame farmer setup, the build looks to convert to a double Herald setup to make clear extremely fast.
Wind Dancer
Wind Dancer / Clarity
Wind Dancer is a must as the More Evasion buff is extremely strong. Late game setups with Acrobatics can become very tanky, and Wind Dancer is a big part of that. Round your 100 Spirit out with Clarity for mana sustain.
Orb of Storms
Orb of Storms
Orb of Storms triggers extremely fast, and is mainly used to trigger Lightning Rod rather than deal damage itself. The Support Gems are important to trigger faster and deal more damage.
It's also good because you can place Orb down and run around/dodge instead of attacking with Lightning Arrow.
Elemental Invocation
Elemental Invocation
I explained this setup above in the Gem section, but to reiterate, this setup is completely optional. It's much much faster at triggering Lightning Rod than Orb of Storms, but requires 20 extra Spirit on top of INT stats.
If your gear can run it, I would consider using it as a comfy way to mow down bosses/rares.