u/Amles1 — reddlx

I have seen a tutorial by insamnity21 for a bonemeal/Moss farm where the bonemeal is transported via dropper elevator connected to a hopper clock:

I do not understand why the two pieces of redstone dust are needed at the bottom dropper.

I do understand that it powers the bottom dropper although i do not understand why when the dust is not pointing in the direction of the dropper?

Secondly i do not understand why the second piece of dust (The one that is not underneath the wool block) is important?

I am very new to trying to understand redstone so my knowledge is very limited