Tkinter objects are not centering - python-3.x

Question

I am trying to create a simple Python 3.x GUI project with tkinter, just to learn the language better (I started learning Python not long ago), of which the only thing it does is switching between different pages as a button is clicked. The problem is that the objects are not getting in the center of the screen. What's wrong in my code?
Images:
Start Page
First Page
Second Page
import tkinter as tk
LARGE_FONT = ("verdana", 10)
class Application(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
container = tk.Frame(self)
container.grid()
self.frames = {}
for F in (StartPage, PageOne, PageTwo):
frame = F(container, self)
self.frames[F] = frame
frame.grid(row=0, column=0, sticky="snew")
self.show_frame(StartPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
class StartPage (tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
label1 = tk.Label(self, text="Start Page", font=LARGE_FONT)
label1.grid(row=0, column=0)
button1 = tk.Button(self, text="Go to Page One",
command=lambda: controller.show_frame(PageOne))
button1.grid(row=1, column=0)
button2 = tk.Button(self, text="Go to Page Two",
command=lambda: controller.show_frame(PageTwo))
button2.grid(row=2, column=0)
class PageOne(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
label2 = tk.Label(self, text="Page One", font=LARGE_FONT)
label2.grid(row=0, column=0, sticky="E")
button2 = tk.Button(self, text="Go to Page Two",
command=lambda: controller.show_frame(PageTwo))
button2.grid(row=1, column=0)
button3 = tk.Button(self, text="Go to Start Page",
command=lambda: controller.show_frame(StartPage))
button3.grid(row=2, column=0)
class PageTwo(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
label2 = tk.Label(self, text="Page Two", font=LARGE_FONT)
label2.grid(row=0, column=0,sticky="E")
button2 = tk.Button(self, text="Go to Page One",
command=lambda: controller.show_frame(PageOne))
button2.grid(row=1, column=0)
button3 = tk.Button(self, text="Go to Start Page",
command=lambda: controller.show_frame(StartPage))
button3.grid(row=2, column=0)
app = Application()
app.title("Application")
app.mainloop()

Answer 1

I put a menu on the left with tkinter. Everything to the right of the menu is aligned in the middle. How to align to the right of the menu
There is a text on the back of the textbox, but because it is center-aligned, it crosses over the text and the text does not appear.
Tkinter program
All code:
from tkinter import *
from tkinter import messagebox
import tkinter.font as font
import tkinter as tkMessageBox
from typing import Sized
from PIL import ImageTk, Image
window = Tk()
window.title("Ogretmen+")
window.geometry("900x447")
window.configure(bg="#202020")
genelgorunumbaslik = font.Font(size=20)
menuyazilar = font.Font(size=20)
guncellemebuyuk = font.Font(size=15)
def sinifYonetimi():
sinifyonetimiaciklama.config(text="Sınıf yönetimi kısmına hoş geldiniz. Bu bölümden sınıf ekleyebilir ve silebilirsiniz. Örnek sınıf adı: 10 B")
sinifyonetimiaciklama.grid(row=1, column=2)
sinifadigir.config(text="Sınıf Adı:")
sinifadigir.grid(row=2, column=2)
sinifadientry.grid(row=2, column=2)
islemsec.grid_remove()
sinifyonetimiaciklama = Label(fg="white", bg="#202020")
sinifadigir = Label(fg="white", bg="#202020")
sinifadientry = Entry(bd=4)
menubuton2 = Button(text="Sınıf Yönetimi", fg="white", bg="#282528", height=3, command=sinifYonetimi)
menubuton3 = Button(text="Öğrenci Yönetimi", fg="white", bg="#282528", height=3)
menubuton4 = Button(text="Konu Takibi", fg="white", bg="#282528", height=3)
menubuton5 = Button(text="İletişim", fg="white", bg="#282528", height=2)
menubuton2['font'] = menuyazilar
menubuton3['font'] = menuyazilar
menubuton4['font'] = menuyazilar
menubuton5['font'] = menuyazilar
menubuton2.grid(row=1, column=1, sticky="ew")
menubuton3.grid(row=2, column=1, sticky="ew")
menubuton4.grid(row=3, column=1, sticky="ew")
menubuton5.grid(row=4, column=1, sticky="ew")
islemsec = Label(text="Lütfen sol menüden işlem seçiniz.", bg="#202020", fg="white")
islemsec.grid(row=1, column=3)
window.mainloop()