Alright lets bullet point these:
From my Downhill skiing days.... Always
look at the gap, never the obstacles (I actually ran into myself on approch once
being a little too fascinated with what I could see and not paying attention to what I should be seeing, in this case my landing strip.
Changing midfight from FPV to LOS can be lots harder than it sounds, lost my first Bixler over this one, but it did eventually wash up with an incoming tide
There is no such thing as overpowered take offs but there are big problems with an underpowered one.
There is no such thing as ' too many spares'
You can never have too many cableties (zipties) or glues.
A broken foamy is just like a jigsaw, you need all the pieces.... so have a plastic shopping bag in your kit for 'the enevitable'....
RF is invisible, and therefore tricky to work with.
Making your own antennas is both rewarding and more reliable than buying 'factory' built ones (except for the ones that are specialty well known FPV manufacturers)
If you don't understand the term harmonics and its relevance to FPV then learn it now!
And finally: If you're not crashing, you're not trying hard enough!!