how to write the selenium with python scripts for dashboard testing after login

I have written the selenium with python script for login to dashboard navigation with different browsers, and works fine .

But in dashboard page I have to check for about, notifications links...etc.

It is not working fine for me.

the python code for login to dashboard is..

test01.py

from selenium import webdriver;
driver = webdriver.Firefox("D:/testing/selenium-testing")
driver.get("http://localhost:4200")
driver.find_element_by_name("username").send_keys("admin")
driver.find_element_by_name("password").send_keys("admin@123")
driver.find_element_by_id('log').click()

But in dashboard page (path is localhost:4200/dashboard) the testing of links(clicking the links) are not working .

for ex..

driver.get("http://localhost:4200/dashboard")
driver.find_element_by_id("ab").click()

I am new to this selenium .Can anyone help me regarding this