Using a Resonator’s Forte Circuit can cause devastating damage to enemies and is unique to all characters.
Doing your research is most certainly advised.
Here’s what you’re gonna wanna know about the Forte Circuit.

What is Forte Circuit in Wuthering Waves?
Each Resonator’s Forte Circuit works alongside their Normal Attack, Resonance Skill, and Resonance Liberation.
Your Forte Gauge glows the color of your specific elemental ability.

For example, Rover’s glows yellow, while Yangyang’s glows green.
This is the middle of the five options on the screen.
Each Inherent Skill unlocked costs materials and Shell Credit, the universal currency of Huanglong.
Hopefully you’ve learnt how to harness the power of Forte Circuit in Wuthering Waves.