I’m back to Drupal after 3yrs of not touching any drupal projects as a programmer. And it’s funny that I was not able to remember how to get started in Drupal in logging as admin. With just one search in the web I was able to find it. You are lucky to be in this website just looking to what is the drupal link for user or to login.
The answer is just add ‘/user’ to your website url.
So if my website is ‘https://www.sherkspear.com’ and it is a Drupal website. If I’m going to login as admin it will become https://www.sherkspear.com/user ..

Hope that helps. 🙂