[Tkinter] how to add two buttons with different functions in Tk

[LinuxLife]

well...thank you all for your help!! finally got it ! your tips helped me a lot!
would like to make an addition though...
as you can see,i get two values from my inputs (final centimeters and final liters)
is there any way to add a button that sums up some input that i will give in centimeters and the already calculated centimeters output?

thanks again!
(i attach the final code below)

import tkinter as tk


def main():
    window= tk.Tk()
    window.title(" ERRIKOS  Converter")
    window.geometry("800x800")
    
    # create a label with text Enter centimetre
    label1 = tk.Label(window, text="gimme the centimetres: ")
    
    # create a label with text litres
    label2 = tk.Label(window, text="we have litres:")

    # place label1 in window at position x,y 
    label1.place(x=50,y=30)

    # create an Entry widget (text box) 
    
    textbox1 = tk.Entry(window, width=12)

    # place textbox1 in window at position x,y 
    textbox1.place(x=200,y=35)

    # place label2 in window at position x,y 
    label2.place(x=50,y=100)
    
    # create a label3 with empty text:
    label3 = tk.Label(window, text=" ")

    # place label3 in window at position x,y 
    label3.place(x=180,y=100)

         
    def btn1_click():
        litres = round(float(textbox1.get()) * 10)
        label3.configure(text = str(litres)+ '  litres')
        

    # create a button with text Button 1
    btn1 = tk.Button(window, text="print litres", command=btn1_click)
    # place this button in window at position x,y 
    btn1.place(x=90,y=150)

    # create a label with text Enter litres
    label4 = tk.Label(window, text="ordered litres: ")
    
    # create a label with text centimetres
    label5 = tk.Label(window, text="litres in centimetres: ")

    # place label4 in window at position x,y 
    label4.place(x=50,y=730)

    # create an Entry widget (text box) 
    
    textbox2 = tk.Entry(window, width=12)

    # place textbox2 in window at position x,y 
    textbox2.place(x=200,y=735)
    

    # place label5 in window at position x,y 
    label5.place(x=50,y=700)
    
    # create a label6 with empty text:
    label6 = tk.Label(window, text=" ")

    # place label6 in window at position x,y 
    label6.place(x=180,y=700)

         
    def btn2_click():
        centimetres = round(float(textbox2.get()) / 10)
        label6.configure(text = str(centimetres)+ '  centimetres')
        

    # create a button with text Button 2
    btn2 = tk.Button(window, text="print centimetres", command=btn2_click)
    # place this button in window at position x,y 
    btn2.place(x=90,y=750)
    window.mainloop()
    
main()