What are the basic hotkeys you guys use?

I’m a fairly new online player. I’ve ranked up to master Sarg but I feel like I’ve plateaued. I’ve been watching YouTube videos and it’s easy to see that the good players use hotkeys like crazy. The only ones I use right now are shift clicks, T for town center, V to create villagers, and E to take me to my explorer. What other hotkeys do you guys recommend I add?