Instinctive impressions on the early game:

: I'd play in the last corner.

: Not as big as approaching the upper left. White's F4 stone has so much space that I don't even really consider this to be a pincer.

: I haven't read anything out but my 5-seconds-of-thinking move is D4 and I suspect it would be my 120-seconds of thinking move too. This is your area, don't let him connect up so easily.

: I'd play C14 if I played on the left. White's wall is already overconcentrated even if he extends out to C8 from it. But honestly I'd probably treat C7 and C13 as miai and pincer the O17 stone or something.

: First instincts are D9 or D8. White's C9 stone should not be able to connect to E7 so easily.

: Overplay (and White punished you bad for it). The upper side is still the biggest area. D10 is a big shape point but maybe not urgent.

: What are you afraid of? Even if White splits you, both sides are strong. The upper side is still a huge swath of virgin territory and this move is a few points in gote or something.
I think the main takeaways are:
- Where are the big areas? (that upper side!)
- Fight where you are strong (e.g., at

), don't start fights where you are weak (e.g., at

).