How start deepstream

Hardware Platform (Jetson Nano)
• DeepStream Version 5.0
• JetPack Version 4.5
• TensorRT Version 7.1
i would like to learn deepstream but haven’t found a good tutorial. I a fresh developer with nvidia tools but have some experience with deep learning. I would like count the number of orange in a farm orange to a proyect. Thanks

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU)
• DeepStream Version
• JetPack Version (valid for Jetson only)
• TensorRT Version
• NVIDIA GPU Driver Version (valid for GPU only)
• Issue Type( questions, new requirements, bugs)
• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)
• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)

Hi,
We have quick start document, Quickstart Guide — DeepStream 6.1.1 Release documentation
you can start from here, then you can look into samples demonstrated for different purpose.
C/C++ Sample Apps Source Details — DeepStream 6.1.1 Release documentation
for how nvidia plugins working you can see,
GStreamer Plugin Overview — DeepStream 6.1.1 Release documentation,
about your case, you should have your models to detect or classify objects, for how to count the objects, you can refer to sample test1 function osd_sink_pad_buffer_probe