Ok so this may be a dumb question but I'm only 2 months into the trade and I'm having a hard time picturing and understanding the concept and purpose for switch legs and pigtails and when they are needed. I am currently roughing in gang boxes for outlets and lights that are whipped from switches. I am confused on when I need a neutral pigtail and when I need to just join them, wire nut them and tuck them in the box. Also when identifying the switch leg does that also get pigtailed. I'm confused. My coworkers are too busy to ever explain it to me. I hate having to do things that I don't understand. I want to know why I'm doing something and how the process works. I will attach a picture of an example.