Hi Kenadi,
hane at P8 is a big move. Proverb: hane the head of 2 (enemy) stones.In reply, if
hane at P7, you can double hane at o7.
is not good, but after 
, the local shape is such that both B and W want to get ahead:B wants to get ahead at P9, or hane P8.
Here, B is strong enough to hane P8.
W also wants to hane P9, but locally,
W is not strong enough: if
hane P9,B will cut at P8 and fight with W.
So W has to extend to P8 on
.P8/P9 is the big shared points, locally and globally.
W got P8 first with
-- you should've played P8 yourself for .
is too small, too slow. Can you see your 3 stones , , and make a very inefficient shape with 
?For example,
would be much more efficient at Q13.But
sitting at Q11 is very cramped.By looking at this local shape afterwards,
we can tell B made some mistakes earlier here
(starting with
.)Locally,
can jump to o10, or even N9 (more reading required).W got a big point first with
.W ignored your
: why didn't you take the huge hane C16 ? 
is very bad. 
makes a Broken Shape for you, with 
. Very bad.
