To get the Google Analytics Tracking code, Tracking ID at any time
Navigate to Google Analytics
Sign in to access admin panel
click on settings icon ( admin ) at the bottom left corner
and choose the correct Account and then correct property and
click on Tracking info and then click on Tracking Code
Here we got the Google Analytics Tracking ID, Tracing code
Where this use
Tracking ID will be useful to add Analytics using tools like Google Tag Manager , plugins or similar
Tracking code will be useful to add Analytics directly in to your website.