Anyone made much use of HRV (Heart rate variability) for indicating fatigue and deciding on rest

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Existing discussion.

Anyone using HRV? (Heart Rate Variability)

There’s a fair amount of chatter about using hear rate variability (HRV), particularly to track fatigue. Does anyone have any experience with this? Do you find it useful? Any particular recommendations on getting started?

Low HR means overtraining or High HR

I’m a little confused about this. I’ve been reading about HRV which it seems to be a case of a lower than usual resting HE means you may be overtraining but I also regularly see that if you have a higher than usual HE it also could be a case of overtraining. I’m probably missing something obvious but I’d like if someone could simplify this for me. My main concern is to avoid over training.