https://jmeter.apache.org/usermanual/get-started.html
1.0 Overview
When using JMeter you will usually follow this process:
1.0.1 Test plan building
To do that, you will run JMeter in GUI Mode.
Then you can either choose to record the application from a browser, or native application.
You can use for that the menu
Note you can also manually build your plan. Ensure you read this documentation to understand major concepts.
You will also debug it using one of these options:
and View Results Tree renderers or Testers (CSS/JQUERY, JSON, Regexp, XPath).
Ensure you follow best-practices when building your Test Plan.