Capacitance to useful signal conversion
Frequency is usually easier to measure than voltage, so you might see better stability and performance measuring frequency with a frequency counter than with an analog input voltage.

The 555 timer uses an RC circuit to create oscillations with a frequency that depends on the resistance and capacitance.
https://www.digikey.com/en/articles/techzone/2011/oct/humidity-sensors-and-signal-conditioning-choices
Shows how one can be used to oscillate at a rate proportional to a variable capacitor, but the reason we'd recommend a 555 is it's very well documented for all skill levels.

When you have a better idea of what you want to do with a frequency measurement go ahead and ask about it and I'm sure someone can help you out.