code:

from tkinter import *

class App:
    def __init__(self, master):
        self.frame = Frame(master)
        self.frame.grid()

        self.text = Text(self.frame, height=8, width=20)
        self.text.grid()

        self.button = Button(self.frame, text="quit", command=self.frame.quit)
        self.button.grid(row=2, padx=1, pady=1)

        self.text.insert(END, "first")
        self.text.insert(END, "second")
        vvv = self.text.insert(END, "third")

        self.button2 = Button(self.frame, text="add text", command=self.frame.quit)
        self.button2.grid()
            

    def create_button(self, row, text, command):
        self.button = Button(self.frame, text=text, command=command)
        self.button.grid(row=row, padx=1)

    def game_start(self):
        self.T = Text(self.frame, height=8, width=90)
        self.T.grid()
        self.button = Button(self.frame, text="123", command=self.T.insert(END, "gggg"))
        self.button.grid(row=4, padx=1)
      
    def insert_text(self, fill_text):
        self.T.insert(END, fill_text)

    def game_text(self):
        self.quote1 = ("rrrrrrrrrrrrrrrrr")
        self.quote2 = ("ffffffffffffffffffffffff")     

root = Tk()

root.geometry("500x500")
root.resizable(0,0)
root.title("HELOO")

app = App(root)

root.mainloop()
root.destroy()