Disclaimer: My builds are primarily focused at being viable for high level content. For example, a few hours of an endless Steel Path gametype or Elite Archimedea.
They can be taken to Level Cap, but that's not my preferred way to play.
Most builds do not need everything shown here, use your discretion to decide if you need the primed mods, arcanes, and/or archon shards.
There is no correct way to build in Warframe.

The alt-fire always applies two guaranteed procs. The first is based on what you've modded onto the weapon, and the second is either Cold, Electricity, Heat, or Toxin.
Primary Blight and Primary Frostbite can take advantage of this; Blight ends up performing slightly better.

Alternate Setups

• For Corrosive + Cold, swap Primed Chilling Grasp and Galvanized Savvy. For Gas, also replace Primed Charged Shell with Incendiary Coat
• For Magnetic + Toxin, swap [Primed Charged Shell] and [Contagious Spread]. [Magnetic Strafe] can be replaced with [Atomic Fallout] or [Shotgun Barrage]