It’s explained further in the beginner tutorial below, but it’s impossible to clip the highlights with exposure, so don’t worry about them and expose for what should be mid-grey instead. You then bring the highlights back to where you want them with other modules.
The modern way to white balance is with Color Calibration CAT. While you can use it to set a “creative” wb, like you do now, it’s designed more for setting a technically correct/neutral wb, with creative adjustments done elsewhere. Tint in RGB primaries and power in Color Balance RGB are both good choices for creative wb adjustments.
This video is a good demonstration of this concept of technical wb with creative wb later:
This tutorial is getting a bit old, so some details have changed, but it’s still the best for understanding the core workflow: https://www.youtube.com/watch?v=5CmsxxxsMDs
To learn how to use specific modules, watch Bruce Williams’ YouTube videos: https://youtube.com/@audio2u
To take your editing to the next level, watch Boris Hajdukovic’ videos: https://www.youtube.com/@s7habo
Darktable Landscapes is also solid: https://www.youtube.com/@DarktableLandscapes
Nicolas Winspeare/A Dabble in Photography has some good, more technical videos: https://www.youtube.com/@adabbleinphotography8721