AI path editing shortcuts
Selection [black arrow] = V
Direct selection [white arrow] = A
Group Selection white arrow wth plus sign] = Alt A
Pen = P
Add anchor = = [equal sign]
Delete anchor = - [minus sign]
Convert anchor = Shift C
Break handle = Alt key

Toggle fill/stroke = X
Swap fill/stroek = Shift X
Default colors = D

Free Transform = E
Zoom = Z
Hand = H

Crtl key is your best friend
Draw with the pen tool.
Use the CTRL key to edit points as you work.
Release the pen to to go back to the drawing.

Move a segment
Use the direct selection tool to select and move segments:

These various tools to adjust a line
warp

wrinkle

with scissors cut directly on segments to split a shape or line in 2

with the knife you make a cut line ight across the shape and it makes 2 close shapes