Not understanding the correlation between code and geometry with Tkninter

[Intelligent_Agent0]

Hello, I recently started working on a personal app to help me learn GUI programming with python Tkinter. What I am having trouble with is coding the geometry, I learned how to make buttons and labels, but when I run my program I have no control over where they will be displayed within the screen. Here is an example program I wrote, It is to become an online shopping app:

from tkinter import *

root = Tk()

BeveragesButton = Button(master = root, bg = "white", fg = "green", text = "Beverages")
Meat_SeafoodButton = Button(master = root, bg = "white", fg = "green", text = "Meat & Seafood")
BakeryButton = Button(master = root, bg = "white", fg = "green", text = "Bakery")
PantryButton = Button(master = root, bg = "white", fg = "green", text = "Pantry")
Snacks_SweetsButton = Button(master = root, bg = "white", fg = "green", text = "Snacks & Sweets")
Dairy_EggsButton = Button(master = root, bg = "white", fg = "green", text = " Dairy & Eggs")
Frozen_Foods = Button(master = root, bg = "white", fg = "green", text = "Frozen Foods")
ButtonsList1 = [BeveragesButton,Meat_SeafoodButton,BakeryButton,PantryButton,Snacks_SweetsButton,Dairy_EggsButton,Frozen_Foods]

listbox = Listbox(root)
listbox.pack(fill = BOTH,expand = 1)

for button in ButtonsList1:
	listbox.insert(END)
	button.pack()

mainloop()

This is a image of the window python produces from the code:

NOTE: I thought I could show you a picture but I guess this forum doesn't support that.

Anyhow, the problem is, when I run the code, the buttons appear in the bottom center under a large white space. I want the buttons lined up from top to bottom on left side of screen. What can I do to fix my geometry problems?