^ this - build up a big load of data to look at. I've been using one a year-ish and I'm only just starting to get a decent picture of how my body works - and that's still pretty basic.
Don't overcomplicate and remember that you shouldn't lose sight of listening to what your body is telling you - it's ok to use perceived effort and fatigue too (especially if you don't have a coach).
^ this - build up a big load of data to look at. I've been using one a year-ish and I'm only just starting to get a decent picture of how my body works - and that's still pretty basic.
Don't overcomplicate and remember that you shouldn't lose sight of listening to what your body is telling you - it's ok to use perceived effort and fatigue too (especially if you don't have a coach).