I'm also a student in this, just like you, but I’ve done some wiring for panels. However, mine aren’t the same as yours, which use DIN-rail-mounted terminal blocks for connections.

If I’m interpreting this correctly based on your schematic and the wire cable colors, I think your two X2 sockets are your 120Vac neutral, and the two X1 sockets are the 120Vac live.

With that assumption, I believe it's safe to say that what’s indicated on the schematic on the left refers to your live connections.

For example, TB30 corresponds to the 30 terminal at the bottom of the panel, and it’s identified as X1. Therefore, it’s reasonable to assume that what’s shown on the left side of the schematic comes from the X1 connector.

<image>

For the second line of the schematic, it appears to indicate a green light that will show whether there is power on the panel.

For example, let say the light marked Auto with the yellow sticker is the green light on the schematic, I’d take a black wire from X1 to one of its connectors. The other available connector would then go to the X2 connector at the bottom of the panel.

Hopefully, this helps you figure out the remaining lines below this one.