The only way is to click on the desired page.
That is Home page, about us and etc.
here is the url: https://arthtraininginstitute.com/index.html

import requests
from bs4 import BeautifulSoup
from urllib.parse import urljoin

url="https://arthtraininginstitute.com/"
r=requests.get(url)

soup=BeautifulSoup(r.content,"lxml")

page_link=soup.select('nav-link a')

for links in page_link:
    link=urljoin(url,links.get('href'))
    r=r.get(link)
    soup=BeautifulSoup(r.content,'lxml')
    print(r.url)