File/function that is executed when I open node from view
You've two ways to afford the problem:
Site building way
If you're using a wiew of rendered nodes (usualy teasers) you can redefine the layout, tags, fields, etc. on admin/structure/types/manage/YOURCONTENTYPE/display/teaser

If you need more options try display suite and fences modules:
https://www.drupal.org/project/ds
https://www.drupal.org/project/fences

Developer way
Editing your view, on the "advanced" colum, "other section" you've the "templates" there the "Theme: Information" item.
There you've the name of the templates the view is using.
You can redefine then on your custom them.

EXTRA BALL: Common sense way
Probably a mix of two others are que best option