Guidelines for SEO audit using SEMrush, Google Search Console and Google Analytics

Hi Everyone,
I have been involved in Guest Posting Strategies in past. Recently I have shifted to On Page SEO. I have not done any practical task on it but have gone through the courses of SEMrush Academy and Ahrefs. Recently I have got a task to do SEO audit of a website in a really bad shape. Can anyone guide me or share any content how to start the audit. I am right now confused how to start the audit or do keyword search. I have access of SEMrush, Google Search Console and Google Analytics.

Start your SEO audit by analyzing the website's technical health,on-page elements and backlink profile then utilize SEMrush,Google Search Console,and Google Analytics to identify issues and opprtunities for improvement.

I am astonished that no one bothered to give any advice.

i also just start seo i have same question..