For those who aren't generally into PID tuning, JB's latest video below is well worth a watch. I just finished watching it all the way through and have certainly learnt something. 

I've been concentrating most of my time at the field just trying to improve my flying skills with the default Betaflight tune, but now that I have more confidence with some of the manoeuvres and keeping my quad in the air (most of the time), the next time I have more than just an hour to spare I think I will take some extra LiPos and spend a bit of that time seeing what different Feed Forward and I Term Relax settings actually feel like in the flesh.

It's quite lengthy video at 45 minutes long so grab yourself a cup of coffee and get comfortable  

i gone learn something today ;-)