How do use the soup.find, soup.find_all in python ?

The problems with your search strategy has been covered by comments and answers posted earlier. I am offering a solution for your problem which involves the use of regex library, along with the find_all() function call:

    import requests
    from bs4 import BeautifulSoup
    import re
    
    res = requests.get("https://www.jobberman.com/jobs")
    soup = BeautifulSoup(res.text, "html.parser")
    company_name = soup.find_all("a", href=re.compile("/jobs\?"), rel="nofollow")
    for i in range(len(company_name)):
        print(company_name[i].text)

Output:

GRATIAS DEI NIGERIA LIMITED

Balkaan Employments service

Fun Science World

NEIMETH INT'L PHARMACEUTICALS PLC

Nkoyo Pharmaceuticals Ltd.

...