Hi! i am a php dev, new to WordPress.
I've been playing around with some guides, learning WP from inside to create and customize themes. I can't quite grasp the difference - or is any - if i edit a file(like header, or index.php) from my IDE or from WP-Admin. I did notice, that some code lines are not noticeable from WP-Admin, in same files. So, is there any difference how i edit the file, when i want to add my custom php\js code?