Discuss those blue lines a little bit...
Blue lines are based on Patterns. Just Google Harmonic Patterns
for many websites that showcase them.
I was taught a mirror technique to clone a line, and use it as possible
direction and price target. Technically it's a technique to clone
a portion of a cyclic time-action.
Line on top is the line cloned and 2nd line is
placed at the low. Noticed the cloned line
follows the same ANGLE.
I use this every day on the 30 min chart.
On the Daily chart it gives me possible direction.
For more details, just read J.R. Stevenson's book.