Hello @AhmedAssad-8581 ,
IoT Central is a great way to start with IoT if you limited knowledge of building a solution, an IoT Platform, based on Azure resources.
Microsoft already did the heavy lifting of building a Software as a Service IoT Platform based on Azure resources like IoT Hub, Provisioning services, Stream Analytics, TimeSeries Insights, etc. You just connect your device to IoT Central directly or use the bridge.
If you want to build your own platform, you will have to be able to program against the resources above yourself.
A good starting point is the Azure IoT reference guide which explains how to set up a proper architecture.
To speed you up, even more, Microsoft provides several accelerators which are pre build solution, open source and available on github. See these accelerators are the starting point for your development team to build your own custom IoT platform.
I suggest you first invest some time in MS Learn learning modules like this one about IoT Central, IoT Edge or IoT in general.
Sander